Greeting to you all. I seek financial advice from you guys.

To be honest, it's not a good idea to look for financial advice on a public forum. It's not a forum full of wealth managers and investors. Literally anyone, including 10 year old kids can answer you here.
If I tell him to buy bitcoin, will he? If I tell him not to buy bitcoin, will he?

5000 is not a lot of money, but I assume where you guys are from it is, since you're giving this as an example of wealth that allows for luxurious lifestyle. I mean 5k can buy you decent 10 year old car, but that's it.

If your uncle does fine without money, maybe he would agree to employing someone to manage his account? You can set an account in such a way that every amount above a certain level will be automatically transferred to a locked deposit that earns him interest and cannot be withdrawn for a certain period of time like a year. Maybe your uncle needs someone to lock some of his money in a bitcoin hardware wallet for a year or two?

There's one thing I know for sure, he'd be better off saving it in bitcoin than drinking it away.