Congratulations on your achievement the fact that you are still fighting no matter how hard life is could already be considered as a big win for you, if you could continue to invest in it then I guess all you need to do is to wait for the next bull run to happen to take profit.
Just remember to take care of your health and also secure your investment, don't let it sit on trading sites " not your keys, not your crypto".
He has plenty of time on his hands for sure, but I do hope that he doesn't get stressed out about this investment. I hope that he will just do it and not really trade on it, as it is stressful and there is a possibility that it can affect him. Holding is better for his situation, and he can just forget about it for a couple of years. Also, also it is best to have a hardware wallet and tell your family about your investment just to be safe and in case of emergency.