Trying to rankup in CS:GO. Was Silver 3 yesterday, have won 20+ games in the last 2 days of pretty constant playing, and I just only ranked up to Silver 4 tomorrow. Anyone got tips to the master way to rankup quickly?

I have been mostly sticking to Dust II because its the map I know the most so I feel more confident playing on it. I have also been sticking to weapons I know I can use well like M4A1, AK-47, and the Scout/AWP. I go positive every game by a good margin. For example, if I have 25 kills, I only have 10-12 deaths.

tl;dr I can't manage to rankup in CS:GO no matter how many games I win or no matter how good I am doing. Wot do?