I would go for 20/20/20/20/20 percent for each category. As I don't have a feeling which category would be best. I actually think of you go for 1 category it becomes more like gambling.

This all 20% category could also easily turn out the disastrous. If the economy goes into a next recession both the stock market and real estate can decrease huge. Gold might compensate a little.
Crypto could totally disappear of it turns out to be a bubble.

This all 20% tactic will most likely always keep me above 500k. With having the possibility to double my money.