First post — Curious about rebalancing strategies with a mixed portfolio

Hey everyone, just joined. Been trading for a couple of years, mostly discretionary with some basic risk management in place. I've been dabbling more in long-term positions recently, specifically trying to build a diversified portfolio that includes some $SPY ETFs and a small allocation to $BTC. My question is around rebalancing. I understand the concept of bringing allocations back to target percentages, but I'm finding myself a bit paralyzed on when to actually pull the trigger. Do most people here strictly adhere to time-based rebalancing (e.g., quarterly), or do you find a 'drift' threshold (e.g., rebalance if an asset deviates by more than X%) to be more effective? Especially with something as volatile as crypto, the percentage can swing wildly, making quarterly rebalancing feel insufficient. Any insights on how you manage this in a mixed portfolio?