It is very demotivating for me to come into work when in one day I made more money than almost 2 years salary.
You should re-read what you just typed, because there's probably hundreds of people reading your post who have had the exact same feeling with some altcoin before, then they tried to ride the profits higher and they vaporized taking them back to square one. The fact is, the second any type of life changing profits occur in any asset, the price always craters right after. What % bitcoin can rise in a short duration before said action occurs is up for debate though. Having any type of life changing profit occur and then not taking any profit off the table is the definition of insanity.
If you have a day job that sustains you, and you have tens, hundreds or even thousands of btc, then "taking profit" on them now will be a huge regret 5 to 10 yrs from now.
If in just 8.5 years a bitcoin can go from $0 to $3000, with 99.99% percent of the world not even invested yet, then surely it has plenty of room to run to $20K, $50K, or whatever in the next 8 years. It is not inconceivable in the least.
And you keep blabbering on about it having a chance to "go to zero." Not a chance now, no way. I'd wager that even if a 0 day, network-killing flaw was found tomorrow, bitcoin would still not go to zero.