Can I use such tactic?

In theory you are correct, as long as you realize that it's not anywhere near as significant of a role as providing awesome content and having visitors remaining on the page. It is all about the actual user experience that determines your rank in Google, not filling out meta tags or stuff like that. So keep doing what you're doing....but focus on the actual quality of the information you're sharing.

And to clarify Tom's point....he is talking about ranking for major keywords and phrases globally. For example, if you want to rank on the first page of Google for "Internet Marketing", then it's going to take thousands and thousands of pages that are written almost perfectly. Hubspot was able to do that about six years back BUT they also spent millions on their content...so that's not something worth pursuing.

On the other hand, if you want to try to rank for "Internet Marketing New York", then that's entirely possible to do with a small amount of great content. It's still going to require a good 20-30 pages in most major cities, however, and in some areas it may take more than that....only research can tell you for sure.

So for your specific situation (ranking for a local restaurant) keep doing what you're doing and you should see positive results if the content is great. That means posting lots of custom images that are properly labeled, tying in short videos and writing fun content that your customers would want to take the time to read. Like Tom said, social media is crucial as well.....but make sure the content is social by nature.

For example, nobody will bother reading an article titled "Pizza Hut in Sacramento, CA has the Best Pizza Around!" That's an ad and not social at all. So you have to get creative and make it interesting enough that people will read and share it.