Make sure your content is original, not AI generated and entertaining. That should be enough to qualify for leo.voter
As for RC, you need to get some $HIVE tokens and Power them up so you increase your Hive Power, which will increase your maximum Resource Credits.
Resource credits regenerate every day so if you stay active on the network, you will eventually get to a point where you won't need to worry about them because you will have way more than you need. It doesn't take much to get to that point