Every decision is in your hands, I do not recommend buying bitcoin in large quantities when bitcoin is at a high price, there is no certainty that the bull market will make you a big profit from buying bitcoin. My suggestion is to exchange the altcoin you have for Bitcoin then save it until bullishness occurs again this year. If this is a good start to your decision, do it in principle in your own way.
Everyone can think accurately for himself according to his benefit so we can only give suggestions to them that if someone is not capable financially to buy Bitcoin then altcoins are also a good source of earning like ethereum and Solana which are elevated in its worth as the year passes.
One can easily achieve benefit from altcoins if his hold altcoin are money making so this profit is utilized in bitcoin investment then the probability will boost up that in coming years your gain will be enhanced.