How can I DM with aphantasia?

For those who don’t know, aphantasia is a condition where a person basically lacks a mind’s eye. As such, I cannot imagine characters or places that I read about, let alone create them in a way that will allow others to imagine them.

I first started tabletop RPG’s probably 5 or 6 years ago. I don’t have a huge amount of experience, but I think I’m knowledgeable enough to be able to run a campaign. I was spoiled with my first GM, as he was incredibly imaginative. His worlds were always expansive and unique, and he seemed to adapt to anything my crazy party would throw at him. His campaigns were my favorite, and I suppose he’s somewhat of a role model for me. The trouble is, I don’t know how to do that. I like the idea of building a world, but it’s very hard to do without being able to visualize things. I can’t picture a map or a city or a person. I can (sort of) draw, which might help, but creating something worth drawing is where I get stuck.

What kinds of things could I do that might help me create a world, or at least run a campaign? I know I could just get campaigns that are already created, I want to go beyond that. I’ve let it get in my way for a long time, but it’s about time I do something about it.