It depends on how much investment you want to give to it.
I've used to give aoc lessons and the biggest mistake is that new players or even old but non skilled players, want to reach 2k from 1500-1650 level within weeks playing few games on the weekend.
To improve, as anything in life, requires practiser and persistancy .
If a player really commit his time and effort to practise, start learning build orders, strategies, how to play with diferent kind of maps, they will improve for sure. But it takes a long road for it.