How do I do that?

Play more fun games for ranking. Start with beginners. Don't jump straight into playing against experienced players, as it won't be very rewarding. Then, gradually, you'll start to understand what's what, your level will increase, and you'll feel your strength growing.
And it's also a good idea to watch streams, as they contribute to your improvement. But the most important thing is personal practice. The more you play, the better.