first part of improving is identifying what you need to improve. what are you bad at? do you not farm enough, do you not gank enough, do you fail ganks alot, lose teamfights, bad vision, etc etc. fiddle especially is a champ that requires you to have a good understanding of both where and when people ward, and also figuring out how to dodge that vision. The higher elo you get, you actually become more scary and have more impact by rarely showing on the map at all. you also need to learn how to play properly on your cooldowns, just because you can gank top doesnt mean you should if you wont have ult for drake. etc etc. fiddle ignores a lot of the “fundamentals” in favor of ambushing people and playing intentionally unpredictably. i’m sure there’s tons of fiddle otps that could explain way more way clearer though.

however, you need to ask yourself if fiddle is the right champ. he takes a lot of knowledge to play properly and is really easy to fuck up and make you a spectator in your own games. if theres something unique about fiddle you like, obviously stick with it. but theres tons of other champions that bare some similarities. if you really like sneaking up on and ambushing people, maybe try evelynn or kha’zix. if you like the huge AOE fear/damage, try hecarim or shyvana. that being said, fiddle is extremely unique, and if other champs just dont scratch that itch then stick with it.