Which sci-fi titles (movies, books) do you consider comforting, cozy, something you come back to from time to time? For me, I guess it is The Matrix. Still holds up to this day, gets better with every re-watch, and gives me a sense of peace when I need it.
Anything written by Becky Chambers is like a comfy blanket for your soul. She puts so much humanity and empathy in stories about aliens.
I get that OP is almost more thinking of people’s “comfort food” works that serve that need for them personally, but Becky Chambers is very specifically writing to inspire that kind of feeling from the get-go. Life can get hard, bad things can happen, but good things too, and people (including pan-sexual bird aliens) are just living in the future the same way they do now and most of them are trying to be decent.