I haven't playtested it solo myself, but I know folks have done it successfully
Hogwarts is Powered by the Apocalypse, so anything that adapts PbtA games for solo-play should work. (The game is most heavily based on Monster of the Week, Masks, and Dungeon World, so look for tools for playing those solo)
Here's one I found from a quick Reddit search that looks interesting: https://www.reddit.com/r/PBtA/comments/ka3n1u/the_tattva_oracle_a_simple_way_to_play_pbta_solo/
Hope that helps some!