I'm not sure what they should do. they have some good pieces but the depth is lacking. usually their way was getting one or two free agents and hope everyone has a good season.
what I would do is a Cubs style total rebuild. unlike the Cubs after 2011 they actually do have good assets to trade. if you trade sale, abreu, eaton and Quintana you immediately have one of the greatest farm systems of all time.
of course that could mean a couple 100 loss seasons but it probably is the best chance to win again.