Merit is subjective and it given for quality posts, so other users woukc merit you if they find your posts merit worthy.
If you want to get more merits, increase the quality of your posts and do not make posts simply for the sake of making them.

You can have a genuine interest in the off:topic and altcoins section, but you should understand that your chances of getting nerited is greatly reduced as users rarely give out merits there cause majority of the posts are shitposts.