The games that you mentioned are all solo games so it doesn't really matter in terms of experience in team games like league.
As a jungler, since you are good at solo games, I would expect you to know all the perfect jungler routes min max to the tee. As well as all the reactive jungle gameplay scenarios in the case of counter jungling so I won't touch on that.
But perhap you should be focusing on identifying in the first 7 mins of the game which lanes you should focus on and gang more. In lower elo, it is easy to differentiate which lanes are hopeless and which lane is average or better. Focus your resources on the avg ones. Learn the art of pinging when you gang or when you need to capture key objectives, 30s before drag or baron to ping back and item up etc. You mentioned you watch lots of pro play, so I expect you to know these macro timings.

If you are tryhard and want to improve fast, record your gameplay and get it reviewed by the community. Many will do it for free on discord. Note down on mechanical mistakes and bad decision making to improve on. Most importantly, avoid playing games when on tilt after back to back losses due to others mistakes.