If these decreases continue, it means that the bear season has come. and the best thing to do in the bear season is to collect coins from the bottom. This is the best thing to do to be able to buy from the bottom and sell from high as everyone wants. Instead of withdrawing from the market due to the declines and being offended by the market, your goal should be to invest at the lowest prices and make good profits when a bull season comes again, to compensate for your losses.
They can invest if they have sold their holdings while the price was higher but if they didn't and continue to hold, they may have less money to buy the tokens they have. But its a good thing to do to buy if they have the money. Saylor did it despite the crashing market. It hasn't gone to the very low though so I guess we are just experiencing the dip for it to bounce back up again because where else will the investors go to buy an investment but in crypto once again.