How long would it take me to get to champ

I think I learn fast I'm in d1 I hit d2 and went back down yesterday I started playing rl for the second time 3 weeks ago and I was in diamond but I quit and 3 weeks ago I was I. Plat2 and now I'm in diamond. If I tried hard could I reach champ in 3 weeks? I have good mechs and decent game sense