If you won't invest again, this beautiful success should be what you are proud of. However, 99% of us will choose to buy again and hope for the next success. However, now you buy at $40K and the price may drop to a new low below $20K later, and the profit you gained from last trading may be eaten up gradually by the market dump.
OP, I'm understanding your hypothetical scenario but what I'm not getting is what you're getting at with your question and with statements like the above.
You could ask an infinite number of "what if...?" questions regarding the market, and you'll get infinity+1 number of answers if you start a thread about them--nobody can tell you what the right thing to do in any trading circumstance, because the definition of "right" can vary from trader to trader based on any number of factors. It sounds like you don't have a lot of experience with markets and trading, am I right? Well, you're in for a fun ride, but it's one with a very harsh and unforgiving driving instructor, i.e., learning from mistakes. And you
will make them. If anybody says they've never screwed up a trade, they're lying.
Good luck.