Usually it takes months to be well positioned on google as long as a minimum of SEO has been done, the keywords no longer have the relevance of a time, if however entered they must be consistent with the text of the page and not inserted at random, there are some simple rules that if used give you a good result.

Hello.

"I have already entered keywords into the page properties but I am not still visible online." - Google ignores meta keywords. Since 2009.

"I would be pleased to learn about other tips" - I would start with this. You can also read this and this.

Please note that the visibility of your site in the search is highly dependent on competitors. If there are many of them and they are strong, then it will be difficult for you to get to the first search positions.