Gregory's Server@nev Great reminder. this is something that I'm doing... 1/5 of the time? https://github.com/mastodon/mastodon/pull/17845 implemented a reminder that alt text is missing, but I really wish that you could enable an account switch that blocked posts until alt text was provided.
@waffles There is @PleaseCaption. :blobcat: Follow it and it will remind you if you post an image without a description.
If you're using an app, you might consider switching to one where the image description feature is more prominent/less hidden (if that is the problem).