Regarding volunteering, I have always volunteered especially when I was a stay-at-home mum, when I listened to readers at my children's school, accompanied them on trips, was treasurer of the toddler group they attended, the playgroup and the pta of their school.
Since retiring during the lockdown of 2020, some of the volunteering opportunities I'd intended to pursue in retirement have not been happening but plenty things have been carrying on as before. I do deliveries for the food bank and help with a local charity providing for various community groups. Hopefully more things will reopen soon, but I don't have as much spare time in retirement as I anticipated. It's true what they say - you wonder how you ever had time to go to work!
I've joined a local 'simply walk' group for a weekly health walk followed by a sociable coffee afterwards. On my way home from that I smiled at someone in the street and ended up having an impromptu conversation which only ended when her taxi arrived to pick her up. As someone up this thread said, 'Just saying Hello to someone in the street is valuable. I realised she was probably lonely and walked the rest of the way home with a 'warm fuzzy feeling' of having made a difference.