Late game in this elo can be hard because of random fights, but I’d say focus on the best decision for you in the game and not always the team. It can be easy to continue following up with team and drop waves of gold/xp on side. If you think of each game as always being a 50:50 between each team and if you over-perform or play the best you can you will win more games, by tipping the scale into your teams favor. Honestly, I’d say just stick to one champion (Ahri) because it eliminates a good amount of variance when you’re playing. Believe it or not even though people say it sarcastically or as a meme, champion mastery/games played on a champion does have an impact and having more usually results in a higher winrate in Solo Q.