I think a fabric stash ("resource centre") is something to be mindful with, I know I've over bought in the past, but also I use stuff from my stash a lot.
Early on I bought a lot of cheap fabric, I experimented with colours that don't really suit me, I bought wool and suiting. It was always too warm in the office to wear my nice wool jackets. And some of the suiting got made up, but I didn't have the time or skill to make too many of the planned suits.
I've given quite a lot of fabric away to charitable groups (through an intermediary), to friends and family and sold some on here. Bought a bit, but a lot less than I got rid of.
I shopped a lot at roll end shops, the sort of place where the fabric content is sometimes unclear, the prices are good and if you don't buy it that day they'll never have it again. To be honest that's had mixed results, some great outcomes and some what was I thinking pieces.
As I sewist I am mostly inspired by the fabric first, it does 'talk' to me, so a lot of my projects are driven by the fabric.
Fortunately I've also been a big fan of SWAP - Sewing With A Plan, for many years so often sew mini collections so everything works together and I mostly keep the pattern and colour to tops, with plain bottoms (mostly trousers) and plain (but sometimes bright) layers.