There were only two halvings in the history of bitcoin. So I dunno if it's sufficient information for any pattern analysis but most people tell something like this will follow.

Buying BTC at this point for a long term is a good idea imo. Personally, I don't have a huge portfolio so I'm not into De-Fi yet. I dunno what BlockFi interest rates are at this moment in comparison to Nexo or Celsius. But I'd rather prefer Maker DAI platform if I had significant investment in bitcoin. I guess, your son knows better than me.

I'm thinking to diversify into coins like XTZ, LINK, ADA & ATOM with my STEEM power downs for now. I'll dream for bitcoins if Justin Sun can pump STEEM to the moon soon :)