7 SEO mistakes you are probably making (and how to fix them in 2027)

SEO rarely fails for a single spectacular reason. It fails because of a pile of small decisions nobody reviewed. These are the seven mistakes we see most, with the fix for each one and a way to check it in ten minutes.

Our own case: what our blog taught us

Before the list, a piece of our own data. When we reviewed the On Viral blog with Search Console and Google Analytics 4, in 12 months it had received 38 clicks and 14,744 impressions, and all the clicks came in the first quarter of 2026. Many articles had no audience and no connection to the customer we want: we removed or merged them. The two image size guides, on the other hand, added up to 1,585 and 758 views in GA4.

The lesson connects with almost every mistake that follows: publishing a lot without thinking about who searches for what costs time and does not rank.

Mistake 1. There is no calendar based on keyword research

Writing about whatever comes to mind is the most expensive way to do SEO. Before publishing, research what your customer searches for, with which words and with what intent. With that list, build a calendar: which page, for which query, in which order.

How to check it in 10 minutes: open a spreadsheet with your last ten articles and write next to each one the exact query it was written for. If you cannot write it for one of them, that article was made without keyword research.

Mistake 2. You have not thought about your website’s architecture

An organized website has one page per service, categories that make sense and internal links that lead from articles to the pages that sell. Without that structure, Google does not understand what is important, and neither do your visitors.

Google sums it up in its SEO starter guide: unique titles for each page, URLs with words that describe the content and internal links with text that says where they lead.

How to check it: count how many clicks there are from the home page to your main service. If there are more than three, or if the service only appears in a menu, structure is missing. Also check that no article links with text like “click here”.

Mistake 3. You do not monitor your rankings

If you do not look at Search Console, you do not know which queries bring you impressions, which pages dropped or what opportunity you have in positions 8 to 15. Check it every week. It is the cheapest advice and the least followed.

How to check it: open the Performance report, filter by the last 28 days and sort pages by impressions. Those with many impressions and few clicks need a better title or a better answer at the start.

Mistake 4. You believe longer posts rank better

The one that answers best ranks. An 800-word article that solves the question directly beats a 3,000-word one that goes around in circles. Make it longer only if every paragraph adds something.

How to check it: read your article and cross out every paragraph that does not change what the reader will do or understand. If you cross out more than a quarter, your article is long out of habit.

Mistake 5. You do not know how to find profitable keywords

It is the worst of the mistakes. A profitable keyword has purchase intent: “price of braces in Santiago” is worth more than “what are braces”. Prioritize the ones used by people who are already comparing options, and keep the informational ones as support to build trust.

Type of search	Example	What to do with it
Informational	what are braces	Supporting article that links to the service
Comparative	invisible aligners or braces	Article with a table and a decision criterion
Transactional	price of braces in Santiago	Service page with price, city and contact

Mistake 6. Covering generic content with technical tricks

A well-optimized title does not save a page that says the same as ten others. Google’s May 2026 guide on its AI features says it plainly: what weighs most is “non-commodity” content, with a perspective of your own that an AI could not assemble from other people’s pages. Add your experience, your data and your cases.

Speed also counts, but as a foundation. Google publishes clear thresholds on web.dev: LCP should be 2.5 seconds or less, INP 200 milliseconds or less and CLS 0.1 or less, measured at the 75th percentile of visits, separately on mobile and desktop. Meeting them does not make you appear first, but missing them hinders a good page.

Mistake 7. Chasing AI with tricks Google says are not needed

There is a lot on offer for “AI optimization”: llms.txt files, chunked content, special rewrites. According to that same guide, Google needs none of that for its AI features. Spend that time on what does add up: indexed pages, a good page experience, Google Business Profile and reviews. For other companies’ assistants there is no equivalent guide, but what helps is the same: clear, verifiable answers.

How to avoid them, in order

1. Do the keyword research and the calendar.
2. Organize your website’s architecture.
3. Connect Search Console and check it every week.
4. Write what each topic needs, and no more.
5. Choose keywords by purchase intent.
6. Add your own perspective to every page and take care of speed.
7. Drop the AI tricks and improve the basics.

If you want to understand the whole picture, read what SEO is and what its pillars are. If your question is what to post on social media to attract visits, see organic marketing for your business. And if you would rather we review your website, message us on WhatsApp.

Sources

Accessed on October 25, 2026.

• Google Search Central, Optimizing your website for generative AI features on Google Search, May 2026.
• Google Search Central, SEO starter guide.
• web.dev, Core Web Vitals.
• Search Engine Journal, Google’s New AI Search Guide Calls AEO And GEO “Still SEO”.
• Our own data from the On Viral Agency blog: Search Console and Google Analytics 4, 12 months to October 24, 2026.