I have been purchasing bitcoins since 2008 -too bad I gambled, invested, and gave away most of those profits!!! Sadly I'm not a multi-billionaire today, jsut a millionaire at this point :-().One thing I've learned through experiences is that the price of BTC is explosive in its upwards moves, it goes up a LOT during bull-markets and doesnt go down a LOT until bull season is over and finished, all of it's down-swings have been shorte-lived. MOST of the time, it's value relative to the USD has been going steadily up when you look at it year by year.My point is, I would not invest 50K in cryptos all at once, right now. I would (and do) however invest about 5% of my income in cryptos every 3 weeks. I never sell because I know its going up and myself going up with it, and if I spend them, I normally buy enough to make up for it and maybe a bit more. my advice: NEVER sell out when the price declines (unless it's guaranteed that the crypto is dead and won't recover which won't happen), and KEEP YOUR COINS SAFE in a hardware wallet, or paper wallet.Only invest what you are willing to lose even you now the only way for you is UP.