I ended up in a managerial position at my company somewhat against my wishes due to various circumstances and I don't know how to reconcile this with my leftist beliefs. I do what I can to give my team raises whenever possible, and encourage everyone to take as much time off as possible, but I can't help but feel like a traitor to the cause. I have a mortgage and a kid on the way so leaving this job isn't really an option, but how else can I be a ally to the worker movement?
Everyone else has already given good answers, as someone in tech with a pretty based manager I'd recommend occasionally dropping a couple leftists dog whistles to give your workers a heads up that you're with them and got their back. Or outright tell them that your job is to shield them from the shit at the top and not to snitch on them to the people with firing powers. Or both honestly.
But this is the same "servant leadership" advise that capital gives managers. How is the worker supposed to know which is solidarity and which is capitalist bullshit?
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Usually if you back it up with your actions, and also accompany it with jokes about the bourgeoisie (incl. wishing violence on them) or anticapitalist and labor history anecdotes, like the battle of Blair mountain or making disparaging remarks about Amazon trying to reinvent company towns or whatever, it helps to differentiate.