Can I ask in every post for getting some merits from people at the end of the post line?
That's not possible, try to be more creative in sharing ideas, news or learnings that may benefit others. In that way you can get merit if they will appreciate your post. It's quite hard to get but wait as sometimes there are give away merit post that you'll be asked to link your post and may consider your post. It's in their judgement whether they will give you or not. Try to share more interesting posts and it may came without you noticing it.