I agree that acquiring a "big bat" is needed, but the big bat needs to be pretty damn good to make it worth our while.
Taters in LF and Wagner at DH who projects for a 118 wRC+.
Taters at DH and use one of these guys for LF: Roden projects for a 109 wRC+, Lukes 104, Barger 103.
All of the above mentioned names bat left-handed so Schneider (104 projection) makes for a decent platoon partner.
JD Martinez (101 projection) probably isn't a big enough bat. I'm not even sure that Luis Robert (104 projection) is worth it.