Nobody knows the future. Just like any other investment, you have to take the risk and play the game. If you think spending $30k or more is too much, then lower it until you can feel safe even if you lost your money. Don't risk it all and do DCA to play it safer.

I personally just buy on a monthly basis without looking at the price and plan to exit a few years later. Design your own strategy and the risk you can take by yourself since you're the only one who knows your condition.