That's a great question! If I had purchased 10 bitcoins when it was $400 I would be way ahead, but that is hindsight for you. Now that Bitcoin is regularly over $4k, it's harder to make that kind of return. That said, you can still make profits buying Bitcoin on the dips. Some people would then sell when it hits new high, but if I had the cash I would buy on the dips and hold for long term. If you have enough cash you can mine and also invest directly. I suppose you can do a serious analysis in a spreadsheet and then make your decision. Best wishes whatever you decide.