I think you've identified one of the hardest problems in crypto (and maybe trading in general) - i.e. when should you sell? A lot of that really depends on your personal situation, risk tolerance, how much you have invested, etc, but what I generally do in situations like you're describing is to sell half. That way it works out pretty well in either case - if the price continues to climb you still get some nice benefits, and if it falls then you've still cashed out a decent amount and made some nice gains.

Either way, you should definitely take your time to congratulate yourself. Getting those types of gains in that time frame is pretty incredible, even for crypto! Maybe you should start a crypto "picks" service and charge a nice subscription fee for people to join and get the inside scoop on your next 8x investments :-)