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To make money you should enter the market in small amounts and do it periodically. A single investment can put your capital at greater risk which should be avoided. Proper and objective control of your capital is in your hands, so you should avoid the tendency to invest in haste and develop the habit of patience so that.
You're not completely right, even if the theory is correct. If your sole investment is made in bitcoin, then you have likely avoided one of the risks of most other investment risks, especially regarding investment instruments. Bitcoin is the best investment instrument in crypto, it is different from altcoins, in the long term bitcoin is more trustworthy than most of the altcoin.
Investing regularly is a good strategy to consider, especially if you have extra budget. If so, you might consider DCA and buy regularly when you have the budget. Many investors practice this strategy for the purpose of accumulating bitcoins, so over time their portfolios grow larger.