I think once you have a better feel for what you like to make, your style of quilting, and the patterns you gravitate to, you will have a much better idea of how to build your stash.
For example, I now know that I loveeeee making scrappy quilts, I Spy quilts and D9Ps. Sure I make lots of other things too, but those are my go-to's.
So for stash building, I know I can reliably depend on the remnant bin for scrappy and novelty bits. I have a good idea how much fabric I need for a D9P in different sizes.
That said, I also know that with the wealth of free patterns available and the wonderful resource of this board, whatever amount of a fabric I have, I can find a way to make a quilt I will love from it. So if I just have to have it, I get it. Maybe I'll just pet it for a while, but I know it's time will come.
Happy, happy stash building hugs and smiles!