Things that will be hard to repeat:
Semien, even if he comes back next year -3 WAR
Ray, see above -3 WAR
Failure to sign one of the two -4 WAR
Incredible SP health -4 WAR
Things that are likely to get better:
Bullpen, just by random chance, can't be as s*** as it was this year +3 WAR
Full year of Manoah +2 WAR
Full year of Berrios +2 WAR
Full year of Springer, which means less for Grishuk +2 WAR
Bichette and Guerrero get even better +2 WAR
That's -3 WAR on a 100 win talent team. The Jays are starting with a base of around 90 wins with the top two priorities being resigning Semien and Ray with a distant and very achievable #3 priority being re-signing Matz.