That’s a tough question. Music’s emotion and will you feel the same listening to a recommendation as I do? Like when you say there’s a melancholic mood in a piece - I’d probably wouldn’t have put it like that. 
Staying with the piano but from later times there are always Chopin’s Nocturnes or Gabriel Fauré’s Piano works. Of course Franz Liszt wrote a lot for piano - and did a lot of transcriptions too.
Or simply more from J. S. Bach; have a listen to his Goldberg variations for instance, never hurts …
Antonio Vivaldi may be worth exploring, he’d sound a bit more “like Marcello” being a contemporary from Italy.
Or … I don’t know. Be curious or browse a little in the
thread. May give inspiration too (there’s classical stuff mixed in between).