Right on. I don't suffer from depression but my partner does. Because I don't have much experience with it myself, at first I was completely clueless about how to be helpful and supportive. Eventually I realised that just being around, ramping up my own affection and gregariousness just a bit, and not obsessing about the depressive state is already noticeably helpful.
Hugs and cuddles are not things you can do yourself. Not everybody has the privilege of having those options so you might as well list things like winning the lottery. If you do have money though, I have found that massage can be at least a partially acceptable surrogate for other types of human contact and social interaction, if you are in a location where that’s an option.
Positive human contact. Hugs, cuddles, and conversation can make a huge difference. We are social animals and it really does make a difference.