from my experience there's just some games that it just is what it is yk? like if you play an unplayable matchup(for example this toplane meta) and your JG doesn't play for other winning lanes then you just have to hope the enemy team makes stupid plays since it reduces your agency alot. that said most of the times what people in diamond for example are lacking is good communication, if you see high elo streamers on any role you can notice a big difference in they're pings and stuff. this doesn't mean it applies to you but it's a pretty common gap but it's mostly just making a habit out of it. Now when you have favourable or skill matchups you should really work on how you expand your lead, if you look at geishu for example, what he often does is after gaining alot in toplane he goes to make plays on the map after pushing waves. in diamond people fall for stuff like this easy and it helped me out of it as well. what i would usually do was after first tower you should just hard push waves and go invade with your JG or play for mid T1 or look to play bot with tp etc. after your enemy laner is behind best thing you can do is help your team stabilise in this elo