a few of my friends/family all help out volunteering in various organisations (and have done so for years) so hopefully may give the OP some ideas. my girlfriend volunteers at the local neighbourhood park – organising events, clearing litter, raising funds for new/better signage, paths, fences etc. i’ve helped out too but struggle to do it regularly with work/other commitments. she also volunteers every now and again at a local volunteer run independent cinema/venue, as well as on ad-hoc voluntary days run by the council. i’m aiming to help out at my local bike charity a bit more but it’s proving more difficult than initially thought (it’s only open when i’m at work and there’s a waiting list!)
my nan helps out at her local community garden, she’s been given her own little plot now so she can grow her own veg to eat/trade with other folk there
my mum used to volunteer with a counselling charity, helping recently bereaved people through very traumatic times. pretty hard that one, she’s recently stopped doing it due to her work moving to evenings
one of my friends is a mentor for a local lad who’s previously got into trouble and is now back on the straight and narrow. not met him but heard that’s going well
a mate at work volunteers at the local community farm alternative weekends