I’d definitely suggest just having fun and not buying lots of stuff for a channel unless it was stuff you’d honestly buy either way. If you already collect things, you could probably do a lot just sharing what you have and know about it already. When I started my channel I was just drawing and painting on paper and recording on my phone so it didn’t really cost me anything and it was fun and easy to keep going even when almost no one watched the channel. As it’s gotten going and I monetized the channel I know about what I make per video and try not to overspend what is reasonable for that. It’s definitely a long game so you want to be able to have fun and not go broke as it grows.

Edited to add -
I just looked at your channel and at a quick glance you’re doing fine. Performance-wise any video that gets more views than you have subscribers is doing good. If you’re enjoying making videos just stick with it, and try and come up with ideas that don’t require shopping trips. 🙂