The biggest thing the Jays can do to improve is have their porky trio of core players actually get in shape, stay in shape and produce how they are capable of. Vlad, Kirk and Manoah can add 10 wins to this team over what they provided last year.
Springer and Varsho can be better too, although Springers age might be an issue now. But Varsho in CF with a league average bat can add a couple more wins too.