Say you've been blessed to have no need to work a job anymore, have no dependents, are still in OK health and can get around without help. You guess it would be a good idea to give back to others who are worse off. Your friends, neighbors, extended family are all doing fine. Your chapel is focused on saving souls, and people there are too spread out and too busy with other things to keep a regular mutual assistance program going.
If you volunteer at something like a hospice, you could be expected to witness and maybe even do things that you know are wrong. If you volunteer at a soup kitchen or a homeless shelter, it's probably run by diocese hacks or some group that says that poverty is about systemic oppression. Even if you manage to do some good, you have to grit your teeth and watch what you say.
What do you do?
You're being too picky.
If someone is practicing euthanasia on the premises, it is NOT your fault or your problem. You are not one of the doctors committing various sins, you are just a volunteer there. For your part, you would be guiltless and actually gaining merit.
Likewise, it's a lame excuse to avoid helping at soup kitchens or shelters because there's a large Novus Ordo or even Communist presence there. Who cares? You save your soul, be a good example, and leave them to their nonsense. It doesn't take away from what you are doing, even if a bunch of them are there because the court ordered them to, or because they believe in systematic oppression, Critical Race Theory, or some other nonsense.
If they were so woke they all started "taking a knee" before black people, holding an "I'm sorry" sign or some nonsense, you would just respectfully decline in a dignified manner. If rejection of Wokeness was a dealbreaker, if they tell you they no longer have need of your services because of that -- fine. You weren't getting paid anyhow. Apparently it was not God's will that you work there. But how about you WAIT for that rejection to happen, assuming it IS God's will in the meantime, eh? The chance of that happening is infinitesimal, almost zero.
On the contrary, a good Traditional Catholic being on hand during the last weeks, days, even minutes of the lives of countless poor souls -- a lot of good could be done. Who knows, you might even save some souls that would otherwise be lost.
Working at an abortuary would be sinful. Such facilities ought not to even exist. But there is nothing morally wrong with a Hospice, a nursing home/care facility for those in the last weeks or months of life. By working there, you don't condone or approve of every single thing that takes place under its roof, however. That includes ministers of false religion being given access and respect, any euthanasia, turning over corpses for cremation, etc. All outside your control, and totally not your problem.