1) Play every day. There's no need to take breaks longer than a day without a real reason, play every day and you'll be cool
2) Play easier maps. It's okay if you don't improve from your current state and/or while trying to play something... a bit out of your range.
3) Play more different maps. Try your best at keeping variety in maps you play, thankfully at 3.5-4* there are many options available.
3.5)dontmashdontmashdontmash Please keep your fingers in good health.
4) Try playing easier maps with high accuracy. 93-98% is okay, anything out of this range will be cool too, but it will suck getting S's later on if you don't stick to it now.
5) Generally play for fun! BUT DON'T PLAY CASUALLY, you MUST feel the game. And don't expect the improvement to come immediately
6) If you already tried all of this, my only suggestion is that you're not in the mood for playing the game. You must know what you're going for, what is your goal, and what are your chances, with that, you need to cheer yourself up with a confident "I can!".
Believe me, I'm only starting to touch area of 5* which is average, and you must know that there's not that much to know besides obvious things like PlayMORE and Be positive about your plays
Mania is a worse game of mind than standard osu!, because mindblocks can appear out of nowhere and the whole game is a mess, sometimes requiring you to play by it's rules, like all other 4k games do. Play with a confidence, play everyday, for your fun, at your pace, and the improvement will come.
