With what the current market of bitcoin is saying now, i wont advise someone to get in currently and invest because its too volatile and already high for one to come in, but a little more patience and time could draw its market down and then anyone can invest to or hold, except for those who are interested on making trades, they can quickly go short or long and make money form their investment.
If you look at the current Bitcoin price situation, it seems that it is indeed very high, unless he is aiming for a short-term target and with a fairly high capital, for trading, floating, then it might be quite good. It's just that for BTC, it will still have the potential to rise above $100k, although who knows how much the ATH peak will be, it's just that, of course, the profit level will not be as high as before. However, if we have a lot of capital, it doesn't matter to enter again, with its own risks.
Or actually what hasn't happened is altcoin season, some top altcoins might still be worth buying now because they haven't approached their ATH. Like ETH, but indeed, this is just speculation and this is still risky. The point is, which risk do you want to take and which opportunity do you want to make potential.