If there is no shift in expectations, then you should reduce your position as the price goes up, per Kelly, i.e. "take profits". It's a great heuristic. If you wouldn't buy something at the current price, why hold it?

taking profits is always a purely speculative move, but a good one. Taking profits doesn't mean you liquidate entirely, it just reduces risk.

E.G. I believe in crypto, but when btc went from 20k - > 50k i took all my profit except my initial investment. It was purely speculative sure, but it drastically reduced my risk without reducing too much profit potential if i still believe in the long term.