So when the market goes down we should invest a lot of money and if you sell again if you sell it again, that’s the professional investor’s job.
You shouldn't invest a lot of money even if it is BTC. Only invest what you can lose or what you won't be needed to sell in your emergency. If you invest a lot rather than your extra expendable money you may got panicked when BTC falls. We can buy BTC as a savings on bitcoin. We all have savings account , and we do fix deposit every month a portion to save for our future . We can keep some of that portion BTC to invest for our future.
There's a guy who made $2M by investing $80k . He invested $30 daily over 8 year
Here's the twitter post you Can watch transaction record - https://x.com/Saylorsatsire/status/1871307303703794160