I'd give Olivares a shot anywhere but shortstop where your offense is faltering. 29yo in AAA with decent bat and + defense. If you don't have a spot for him, your offense is pretty good. Melian's a great hitter with no position on an NL team. If Olivares is too mediocre, package him with Melian for an upgrade somewhere, Point is that without being in contention, you want to avoid trades to make MWR. Find your weakest spots and upgrade with FA leftovers, WW or promotions. Trade if that doesn't work. But if you have no good AA/AAA players and your ML team is going to lose 110 games, you're in deep anyway.