Any time is good but buying during peaks still is not a wise thing to do. Why should someone buy Bitcoin at 100K when there will definitely be a much better possibility? Anyways, it's not a bad idea but it's not the best idea too. At the moment it costs 86K and I think it's a very good time to buy it. We already tested its potential, which is 109K. Bull cycle has just started, so I'm sure we are guaranteed to see it going up to 100K and even further, probably up to 150K or 190K.
Well, yeah. But can you tell when Bitcoin is at its peak? What if market prices continue to rise? Then you would've missed the chance to grab some BTC at a discount (buying low). It's really hard to predict what Bitcoin's "next move" will be. Part of this has to do with market price volatility. Adoption-wise, I'd say we're still early to the game. Especially when a large percentage of the world's population isn't into Bitcoin yet. I believe this will change within a few decades from now. New generations are becoming fond of digital payments.
In the future, people will only transact using CBDCs (aka Digital Fiat) and crypto (BTC, ETH, LTC, etc.). That's when we can say it's late to get into Bitcoin. Until then, I'd suggest you keep buying and "hodling" BTC while it's still cheap. Untold riches awaits to those who wait. Just my two sats.
In bitcoin investment, there is no rule that says, buying at the peak is not a wise decision. Let me explain this to you. In price chart analysis there are times where your resistance peak price becomes your support and vise versa based on the volatility of the market. Bitcoin peak price can sometimes in the future act as the dip. Bitcoin highest high in 2018 is considered a serious dump today, and that is how this current ATH would be considered a dip after we have experienced more circles. However with DCA strategy there is no actual time that is right for buying, you can decide to buy at any moment based on your financial muscle. The earlier you trust bitcoin the less regret time you'll experience.