Hi Paul, Welcome to Permies from the far North West of the UK!
I'm sorry that you don't seem to be getting much help online from people on youtube etc. It may be they are too busy 'living the dream' to respond. I've heard anecdotally that volunteers can be more trouble than they're worth which will put off some from accepting your help.
I'm assuming you've looked at
woofing, and it doesn't suit. Have you considered volunteering at a bigger site such as
CAT or
Findhorn? I'm just thinking those would have more resources to support volunteers and more variety in providing the experiences you are looking for.
Wishing you luck!