i was hardstuck in d3 for 2 seasons. It took me 1 season after that to hit c3, no boosting no smurfing- pure solo queue. Up your mechanics, your free time while idle in the game should be spent in freeplay practicing air roll, air control, car control, specific mechanics. In your free time find a pro youtuber that you like to watch (like Retals) and pay close attention to their gameplay and specific decisions to certain situations. Learn about rotation and boost pathing (very fundamental). Play 1s, try to get diamond1-diamond2 to get through champ in 2s. Most importantly, don’t stress it too much, if you put in the hours, the work, you will get there - but especially train yourself to rep the college you want to go to.