There are quite positive signals for bitcoin in the current year so it seems like a good choice at the current level. Maybe this year bitcoin cryptocurrency will perform great in the short term. However, we always want to speculate for the future price and everything may not happen in time. So it would be difficult for me to answer the question of whether you should hold or sell because it depends on how much you have ever bought and your level of experience with the market and whether you have a fundamental belief in bitcoin as a whole.
You may lose the right price at the right time due to making the wrong decision. You can sell something keeping in mind the market situation. If you buy at a high price and fail to sell on time, you can end up losing a lot of money. Unless you really know what you're doing, it can be difficult for you to make the right decisions.
You are correct. Talking the market is easier than living in it. Right now, Bitcoin is at $104,101. While some are celebrating, others are frozen unsure whether this marks the start of the next bull or the quiet before a correction. The market may be "strong" yet still penalize poor timing. What you said about belief and experience is underrated. Others came for philosophy; some for cycles. That becomes important. It reveals if you experience terror at volatility or lean toward volatility. But I'm curious, in your opinion, would it be more beneficial to learn to react according to your system, even if it means missing a top, than trying for perfection in every catch? Have you personally constructed something similar?
Correct me on this one, but the phrase "Sell in May, and go away" mostly applies on traditional markets like the Stock Market. It hasn't been applied on crypto yet but looking at the price movement of Bitcoin during the month of May in history, the total average is around 8% with a median of 9% which means it's still giving positive returns.
Maybe most investors are doing the opposite of what most are saying and while most really are selling based on the phrase, many are buying Bitcoin at a much lower price. Over the years, that phrase will not be a thing anymore because many will learn that instead of doing what most are doing, do the opposite and instead of selling, go buy instead. That might be what's happening right now TBH with Bitcoin that's why we are seeing a huge price spike. 
Yeah, "Sell in May" comes from conventional stocks rather than crypto. Still, the belief moves individuals even if it doesn't precisely apply. While wiser traders front-run that panic and load-up, some traders dump early out of habit. That explains maybe why we are currently at $104K. But about the 8–9% average, actually, it’s +7.4% avg, but median is ~1%, not 9%. The impact of big years on the numbers is shown by that gap. But the core point remains: going against the grain of crowd behavior frequently yields better results in this domain
Even if the "phrase" is deemed outdated, the reflex remains relevant. Maybe it’s less about whether we sell in May... and more about why we still talk like we should