I will second retros. I have seen team cohesion go up and down based on the quality of the retros. It is really hard to do a good retro, and ideally no one from management should be present for at least half of it. Making a space where people feel comfortable airing grievances and feel supported can really smooth out a lot of friction. Bonus points when common pain points are made known so tooling and process can be identified to make everyone’s job easier too.