At this point, I generally donate money to charities that are providing food, water, and shelter. There are lots of such charities available via dioceses promoting them in the USA, or if you want to donate overseas you can use Missio. My experience in the USA has been that these places generally have enough volunteers and that they prefer to get volunteers through some sort of organized group, like a workplace will send a group or a church will have a whole youth group working on something once a month. They don’t really want people walking in off the street to donate time as they aren’t set up to manage that.
I was involved in prison pro bono and writing to somebody in prison for a while. (The person I wrote to was somebody I knew before they went in. They got out and went about their life and we have had little contact since, for various reasons. They seem to be doing okay from what I see and hear and have a new spouse and family.)
It was a valuable experience to have, but there are certain risks and difficulties inherent in doing it that made me decide not to continue with that as of now.
As for burying the dead, I’ve been doing a ship ton of that with my own relatives lately, sad to say.
I’ve considered trying to find and get involved in some type of nursing home visiting program. I had to spend a lot of time in those places visiting my own mom and it seemed like some of the other people didn’t have many visitors. Also my friend’s mom (who is elderly herself) is a nursing home visitor. I feel especially drawn to helping elderly people because of my mom and in-laws; I feel better doing that than I do working with kids, for example. (I have no kids of my own and the last time I was involved in a volunteer program for kids, which was supposed to be helping them with reading, I had a weird situation with one of the priests running it, which turned me off from further involvement.)