I only would consider selling to buy back Bitcoin to be valid, when such investor musy have been present in the market for at least a full cycle to see how far his investment has gone, of which such investor must have a good stash of Bitcoin and has reach a certain maturity stage whereby he isn't joking around his portfolio but not a beginner or one who accumulation journey and portfolio is still below average ( best word I can use) that's same thing as chasing short term gains because you are just crashing your accumulation journey.
Selling to buy back is reinvestment in Bitcoin which isn't the right phase for anyone who don't have a good stash of Bitcoin or still in early phase of accumulation, you will surely get wrecked if you do.
Selling to buy back is a normal thing, but the small percentage of assets we own will only provide small profits. I am more interested in buying and holding while the accumulation of purchases can still be done according to the DCA method that most people use. The condition of selling to buy also does not guarantee whether we can repeat the same luck because prices fluctuate. If we understand that bitcoin is a long-term investment then the investment concept must also be thought about accumulation and it is best to use several methods to buy and not trade in the short term when the assets we own are very small.
This is just my personal thought because from what I've seen investors who expect to sell to buy usually don't have that strong of a hold on bitcoin. Apart from being new to investing, there are also doubts when Bitcoin experiences a severe correction. If you look at it today, perhaps Bitcoin has experienced a significant increase, but if you look at it 3 or 4 years ago, you will definitely think differently.