I don't want to link mine at the risk of doxxing myself lol, so I haven't vetted any of the listed ones for quality but there's a lot of different directories of various rpgs: https://www.toprpsites.com/ https://rpginitiative.com/directory/ http://rplovers.gotop100.com/
A lot of them are just on forums (proboards or jcink generally) and will have varying levels of activity, but usually it looks like you create a character (or several) and then you write posts as that character in whatever situation, and someone else responds and you go back and forth for awhile. I've had better luck with RPGs where the join requirements/restrictions/etc are super lax, and some fandom-related ones are a good jumping off point since there's already established lore.
ETA: If you've done tabletop things before, it's a lot like that if it were the roleplay-only bits (or the mainly-roleplay bits) except there isn't always a set campaign and isn't generally a DM
I don't want to link mine at the risk of doxxing myself lol, so I haven't vetted any of the listed ones for quality but there's a lot of different directories of various rpgs: https://www.toprpsites.com/ https://rpginitiative.com/directory/ http://rplovers.gotop100.com/
A lot of them are just on forums (proboards or jcink generally) and will have varying levels of activity, but usually it looks like you create a character (or several) and then you write posts as that character in whatever situation, and someone else responds and you go back and forth for awhile. I've had better luck with RPGs where the join requirements/restrictions/etc are super lax, and some fandom-related ones are a good jumping off point since there's already established lore.
ETA: If you've done tabletop things before, it's a lot like that if it were the roleplay-only bits (or the mainly-roleplay bits) except there isn't always a set campaign and isn't generally a DM