I would recommend some 70s, 80s, and 90s hits. Spotify will have some pre-made playlists! The disco era songs will be upbeat and a nice change from the emo songs.

BUT if you'd be willing to listen to a top notch Indie rock breakup jam before you change genres, "Changing of the Seasons" by Two Door Cinema Club was my anthem during my high school breakup, haha.