What to do when you don't feel comfortable in your main role anymore

I have mained jungle for like 3 years probably now, but i feel like i just can't play this lane well enough like in plat level, i'm either not consistent, or too afraid to do something, or just forget a lot of things, when i do play, i cannot carry any games from this position, and i actually don't even feel comfortable anymore when i got stomped very hard a few games in a row, not talking about having fun at all, because i don't have fun in this game a long time ago, i just play it out of habit mainly, but i sometimes actually want to play it. So what should i even do when i feel like i'm just a terrible player, who can't win any jungle matchups anymore, if i win i usually get carried, and i'm just desperate so hard now, i have tryied everything to fix my gameplay and stuff, but it just doesn't help anymore. At this point i have lost 3 plat promos in 2 weeks, and in all of those i felt like i could not do anything to make those games with any other outcome, and my main goal this season is to reach plat, but when i keep falling down to this hole of bad plays and disparity, i feel like it's not possible, but i really do want that plat boarder. If anyone had this problem earlier tell me what you did to fix it.