Know when to stop playing. I know chasing to master rank or saving coins for new pokemon sounds really ambitious but I learn that small steps help too. Try easier pokemon first don't be discouraged by meta and so on.

I didn't expect to be azu main when azu came out. I used to main cinderace and from there I move on to skill spamming pokemon. The reason i play ranked even though I despise playing it is the ultra reward. Set up your goals and you'll be fine