I’ve also tried, and failed with aeropress. I found that grind size is very tricky to convey with words or photos. e.g.

https://elegantcoffee.com/coffee-grind-size-brewing-methods/

It’s almost like a wind-up.

I also don’t know if my grinder is any good. I only know it was expensive.

Even more fundamentally, it would help if I could drink some aeropress coffee made by someone who knew what they were doing.