Agreeeeee
I tried to start designing/modding right after I started playing, and people encouraged me to play more first. I thought "psssh I know how this works, how hard can it be"...but I have a
much better idea of game balance now after having played a lot, and it has also made me more creative with mechanics in ways that (I think?) will be fun and not game--breaking.
Plus, would strongly encourage you to read some games that get lots of accolades from players, like
@Trilt's Rick and Morty game or some old games by DocE or STL.