Of Happ, Suzuki, and Hoerner i'd trade at least 2 of them. Not this offseason and maybe not even next offseason, but before they become FA. Treat them like we treated Bryant, Baez, and Rizzo. Thank them for their most productive years and move on. I don't want post-prime Happ, Suzuki, or Nico at FA or near-FA prices thus paying even more for the same players who will likely decline in production, I would much rather find the next Happ and Nico in our system (or something close to it) and pay them pre-FA salaries, and maybe sign the next Suzuki as a FA, and put that money saved elsewhere (extensions or FA). They're not going to be a 70 win team if we're saving lots of money on salary to spend elsewhere on players who are just as good or better than late prime or post-prime Happ/Suzuki/Hoerner.
Yes we can trade some prospects, we have lots of them. Trading one of Caissie/Alcantara may be fine too depending on the return, since a quality corner FA isn't hard to find in FA.