The Rays manage to do it on a much smaller budget. They almost never trade prospects for established/bonafide major leaguers. Honestly the best thing for the franchise would probably be to trade one of Vladdy/Bo a year before free agency. Hang onto guys like Teo who broke out late and aren't highly-touted around the league. Continue trying to make some shrewd/low-risk FA signings.
The WORST thing for this team IMO would be to make another Berrios-type trade and fully torpedo the farm. A single season can be derailed due to a couple key injuries, I don't like the "all-in" method unless you're trading for players with multiple years of control.