Be yourself. Don't pretend to know something you don't.
This is the only thing that will work in the long run. I'm surprised how many reputable members here are trying to play along with the OP and provide some strategy tips. There is no universal strategy that can make one a better poster, other than just do what you would normally do in a forum and forget aiming for merit.
You do memes well? Can get merit for that if you do it in the right place and time. Know how to swear in 3 different languages? Might work too. Can manually hash a Bitcoin block? Welcome back, Satoshi, here is 100 thousand merits for you. This place is so extremely liberal that you can even get merits by posting about shitcoins which is mindblowing to me but it does happen. And there are many posters who will never get merits no matter how hard they try, that's a fact too.
For example I looked at the few merits I earned and there is no chance I could have predicted that those posts would have earned merits. Except maybe the threads I started. Threads are more likely to earn merits I think maybe because people don't read past the OP. But it would be bad advice to say "create threads to earn merits". Don't do that. Create threads only if you have something to say that is not said in other threads and doesn't fit into other threads.