Hi there!
I don't know about you, but when I started doing digital art I thought I needed many many MANY different brushes.I downloaded so many brushes from the internet... But then someone told me I don't actually need that many, I can do great things with just a few or just one.
I drew this bird with one round brush that was default in photoshop and it came out great I was proud of myself! I later used a fancy brush too make mist around my birdie (so technically i used two brushed but that's not the point haha). But I proved to myself that I don't need that many brushes, that I don't need to get lost while choosing the 'perfect' one for the thing I was drawing. This was such a simple thing and it helped me improve so much.
That day I learned that it's not the brushes that make the drawing awesome, but skills , time and patiencie you put into your pieces :)