I had a similar experience, also hard to find interesting things because searching tags didn't seem to work well. Maybe there isn't enough stuff uploaded yet.
Just about any Agatha Christie mystery is worth reading. I personally love the Hercule Poirot and Tommy and Tuppence series. Another series I enjoyed is the Lord Peter Wimsey novels by Dorothy L. Sayers. I guess the narrow genra I usually read is a cozy mystery because it's easy.
Thanks for sharing, internet archive has a ton of this type of stuff and it's fun to dig thru!