Well in my own opinion I think this is not the right time to buy bitcoin reason been that the price of bitcoin is very high now, you don't know if it still have the potential to increase more than this. This is why you don't need to invest in bitcoin right now, you can wait maybe when there's a deep in the price of bitcoin then you can decide to buy, because by then it will be somehow cheap for you.
you speak with such level of certainty that this is not the best time to buy bitcoin as though you are so sure that bitcoin would not go above this price again. even though i understand that the angle you are coming from is based on the fact that bitcoin just witnessed recent bull and expectedly, you might think we might get some correction that will present a better buying opportunity but the truth is that we are not sure of the extent of the correction that is if there will even be any sort of correction in the first place. for me, buying at this price is not a bad idea as long as he is buying with some amount he would not be making use of anytime too soon.
However I think the choice is all yours because no one knows if bitcoin is going to do more than this, if you also want to take the risk to buy bitcoin now I will advice you use like 20percent to buy bitcoin, and then you can also use the remaining balance to buy USDT so that should incase play A fail I'm pretty sure that plan B is not going to fail as well.
normally, he will have to convert his coin to USDT which is obviously stable before contemplating on what is the best decision to make. leaving is asset in any altcoin will mean that he already risking and exposing himself to the possibility of losing it all with the coin experience a bear. again, if you are uncertain of the future of bitcoin, then there is definitely no hope for altcoin because most altcoins and meme coin are dependent on bitcoin for there pump.