If you have some kind of inquiry to make in general and it's not urgent, then that's cool :) I'll typically answer things posted here within 24 hours. Email works well for this, and mastodon if you're there too.
In theory, I'm on a bunch of things, like Shapchat, Discord, Instagram, Facebook (I think?), Matrix/Riot.im, and XMPP, but those aren't really good ways to reach me since I don't monitor those for notifications. Literally everyone has email, in its modern form it originated in 1981 so it's quite futureproof. Just use that.