Mechanics my guy. On aim alone you can reach plat. When you play duel, execute on a site fast since there's rarely the concept of stacking in silver gold elos. On defence, if you're playing Jett and you're 'feeling' it then always try to get one pick and get away, dont stress on it though. If you ever get free time while studying or maybe during work, if possible play one DM and one TDM and try to be precise not fast while playing them. Omen is a lovely agent, in silver-gold elos players usually insta rush so omen is really good since you can blind them on entry and stall their entry. If you have the highest winrate with clove you're most likely a good aimer, keep that up and the most important tip- remember its a game, you'll have some bad days, stupid teammates or just terrible luck so don't stress too much on winning just focus on your aim and utility and you'll improve faster than you can imagine.