#2 Bullpen Pieces
In my opinion, the teams biggest strength this past season was its bullpen. It was also the most underrated part of the Mets. Much of the bullpen gets a lot of hate from the fans but more often than not, they get the job done.
Edwin Diaz was shaky at times like most relievers but for the most part, was dominant. He converted 32/38 of his save opportunities which is not bad at all. Trevor May also had his rough patches but for the most part, was a reliable eighth-inning man. Seth Lugo had a down year coming back from an injury, but is still Seth Lugo.
Aaron Loup had a historic season where he allowed just six earned runs all season and had an ERA under one. Drew Smith and Miguel Castro were both reliable middle of the bullpen arms who pitched in multiple different roles and excelled for the most part.
With all of that being said, this bullpen needs work. The pieces who are here are good, but they just need more. Aaron Loup left in free agency so there is a gaping hole for a lefty they can rely upon in the bullpen to get guys like Juan Soto, Freddie Freeman, and Bryce Harper out in a key spot. Aaron Loup was that guy last season, I think Andrew Chafin would be their best option to replace him.
If they can't get Chafin, someone like Jake Diekman or even retaining Brad Hand who looked pretty good in his short stint as a Met makes sense. I believe in addition to a lefty, they could use another good arm. Seth Lugo can't be relied upon to be used on back-to-back days, and the Mets would be wise to not overwork any of their arms.
Signing a guy like Ryan Tepera or Collin McHugh would add another really high quality arm, both of which can go multiple innings, and take some pressure off of the other arms.
If Diaz, Lugo, and Castro need a day off, the Mets would still be able to use Chafin, May, Smith, and McHugh that day. The Mets are already over the tax with no limit in sight, so adding depth is crucial.