Welcome back buddy! Definitely hit the nail on the head with Byleth, the matchups get really annoying and very much not fun. Have a hard time going back to Byleth when Pyra and Mythra exist too. Play whoever is the most fun for you, the content will flow in no problem :D
Welcome back bro and dude did you saw the new direct?!! Also congrats on getting the new job!! Edit: Oh I don't even you would but maybe you could share some highlights from Splatfeast?