I see some advise to just convert my profits straight into Bitcoin but in doing that I would be buying Bitcoin at the highest prices so don't understand that.
Consider investing in Bitcoin as an investment. Or as a quick profitable thing. Then you will see that the high price that seems high to you will not seem high. Or you can wait for a dump. However, most of those who invest in Bitcoin do not consider the price of Bitcoin, they just invest. This makes their investment an average, which we call DCA.
But if you consider Bitcoin as an altcoin, then of course you can be scared of the losses. The bull run has not really started. But Bitcoin is still standing in its place. I would say that Bitcoin does not have such losses. But if you are a day trader, then now is not the time to invest in Bitcoin.