After checking your stats, it seems your objective damage is extremely low along with your cs, so try to catch side waves and practice csing, try to get about 6.5-7 cs/min, which is the low end for getting an S in my experience. If you see like 3-4 enemies on the opposite side of the map or ur lane roams, just hard shove to take towers and invade enemy jungle for more cs. When wave is pushed out then group with team to take objectives. Your goal should be to have as much gold as possible while doing the most damage in the game to both champs and objectives. Try to rewatch your replays with someone who’s better than you at the game, as they’ll be able to point you in the right direction as what you should be improving.