Someone I was listening to recently said "you are a product of what you consume" (sadly, I forget who), and I think that's pretty accurate. I watch a lot of videos from other creatives in worldbuilding/GMing space. I read a ton of TTRPG blogs. I look at a bunch of indie ttrpgs and how they've done things... and together it keeps me thinking of new inspiration.

I'm sure, like everything in life, it's not a one-size-fits-all solution, but if you're not consuming the media you want to make, I would start there.