I don’t think my suggestions are “feel good,” but I like Stephen King for this kind of thing. Also techy/thriller/sci-fi from Michael Crichton, Blake Crouch, Andy Weir (which is more humorous), which are all fast-paced and easy-to-read. If you like horror comedies, then Grady Hendrix has some novels that are ridiculous and fun.

If you’re into rereading, then something you’ve already read and enjoyed could be a relaxing read, too!