Back in 2016 when I started out the FUD was tough to wade through. We had forum accounts here making FUD everyday about many topics, and it seemed as though nobody could be trusted, which is true even today. But one thing was for certain, bitcoin was sure to go up and it did go up from its price of ~700$ to 70k$ today.
I have never been one of those people who quit. But to be that strong willed, you need to have a cushion to rely on. For that I always suggest people to have a stable job. Keep investments in traditional markets along side bitcoin. Those good number will calm your mind when bitcoin crashes which is not uncommon.
I don't recall when exactly I quit the forum, it was certainly after Bitcoin plummeted from $20,000, probably after a few months of seeing no positive changes, I started believing it was pointless. Took years before I even checked Bitcoin's price, if it still existed and how it performed. Long story short, I joined during Covid19 quarantine, either in late 2020, if I remember correctly. It's been over 3 to 4 years since then and I haven't thought about selling not even once.
To be honest, I haven't thought about which will be my selling point, because if I'm anticipating it's going to $80,000, then I'd want to wait for $90,000 or $100,000.