Also ask "what addition could make a difference"?
Is it that you could use one more pitching upgrade for the post season, whether bullpen or starter?
Is it that your offense just isn't getting it done?
Is it that you could use a defensive upgrade somewhere?
If you can answer that question, then you may be able to address it in free agency.
Just a cursory glance through your team seems to show no real 2B.
IDK if you have a guy to bring up this season, or if you plan on picking one up in FA, but from what I saw, I would definitely try to address that if you haven't already.
Playoffs are tough as you are playing two 5 round series in which anything can happen. A burnsy said, all you may need is a bounce or two to go your way.