Since his patrons found him on YouTube the best way to reach them on YouTube. I am no good at making video but if someone who makes good videos puts out an update on YouTube about the current situation it could be very effective.
It should be short and to the point. No longer than 10 minutes and simply point out:
1. Well over half his supporters have deserted him since the confessions in his livestream in 2022. (Include the graph that shows this)
2. Psychiatrist Dr Sohom Das analysed his behaviour and described him as a narssisitic psychopath and journalist Andrew Gold described him as like a manipulative cult leader - that’s why nobody will work with him any more.
3. Despite still collecting patrons’ money he hardly makes any videos at all, never mind fulfil any of the promises he made to his supporters during his begging campaign. Wealthy donors have given him money for multiple holidays instead.
Short and to the point. Since his own channel is dormant, the YouTube algorithm might well pick up his name from the title and send it to his subscribers. If it’s well done it could shake off a few dozen of his remaining brain dead (sorry) patrons.