Board Game Arena

It would be nice to create a block on the game information page with information about similar board games in mechanics, complexity, setting with the game selected by the user.. There are a lot of games, it has become more difficult to make a choice.

Not sure what u mean, since there are already filters here:
https://boardgamearena.com/gamelist

I think he means when you're on a game's page, show a block titled "players who play this game also play these games : ".
Some games may have similarities but be on different game sections.
And calculating these suggestions based on other players habits should be easy to do. You can see recommandations like this when you buy on amazon, or when songs are suggested on spotify. It's generated by other users data.