Buying Bitcoin is not a problem but having a good mindset before doing that, many people will think that buying Bitcoin when the price is still high is a wrong movement but in terms of Bitcoin there is nothing like that because the price of Bitcoin changes any time, you can buy Bitcoin and in the next day the price will reduce or increase and that is the nature of Bitcoin no one can predict it.
As long as you are capable of doing what you want then you can go ahead, you can be told to not buy when the price is high and within a minute the price will increase and that will make you feel like the person doesn't give you good advice, people who are become a successful people today in Bitcoin didn't think negative about Bitcoin, so Bitcoin deserves a good mindset before taking any step.
When Bitcoin went from 60k+ to 48k , most of this investors didn't buy thinking it has ended, same goes to the price drop from the major resistance at 69k to 73k they didn't take the chance, now they FOMO tops and I am still sure that they would still contribute to the price dips by selling in loss .
I'm not saying investors shouldn't buy high but if truly they are willing to invest then they must put it at the back of their mind that dips might be experienced which might put them in loss at first before they can start seeing profit since they bought at a higher price , some might be lucky without experiencing any loss at first (minimal but unavoidable) and IMO they can try DCA , BTC price is not only going in one direction , DCA can give them opportunities to catch dips as well as different price entries .
You shouldn't think of the dollar value of your bitcoin portfolio but think of the quantity of bitcoin in your portfolio so that you don't panic because bitcoin price will definitely recover and move farther. I think that any new investor who is serious on his bitcoin accumulation will definitely, accumulate bitcoin in the bull run to keep on increasing his bitcoin portfolio, because you cannot stop buying because it's bull run when you have the money to continue buying.