We are close to halving, and there isn't much time left according to some experts. So if you haven't made any investment in the market till now and are still waiting for a major correction then you should start your DCA from now on until the bull appears in the market. Market rallied after red september but it is nothing compared to what is upcoming. So as you have said whats left will only be regret if you don't take any action right now. That doesn't mean you will go all in at once. Just try to invest gradually to build up a portfolio.
Time is really running out for those that are still on the sidelines and have yet to decide to invest or not, and the longer they wait the higher the price they will have to pay if they finally decide to join this market.
I can understand they may not like to buy after the sudden recovery we have been experimenting, and some of them may like to wait to do this until a correction takes place, but since there is no way to know if the correction will actually come, they need to take a decision and do so soon.
Time is running out is what I hear all the time and a very good reason for the FOMO indeed. But the question at this point is; should we let the FOMO push us and cause impaired decisions in our trading/investment? It shouldn't be so, we should follow it as we see it in real-time, and what I see now is that the market might not be making some dangerous bullish movement anymore until next year. This applies to the major coins, although some altcoins that are new like those with Ordinals and BRC-20 related are moving well. The new meme tokens are moving well also and might not have the same pattern as other coins/tokens with good projects and utility.
With all these, I believe that studying the individual charts and fundamentals around the coins/tokens we want prior to buying them is the way out. We can just generalize advice at the moment, and for instance, some coins are already overbought and are in their corrective phase. This is evident in their negative price action as well, so we should be informed and careful with each coin/token according and individually. However, in general, when it comes to an average come asset in cryptocurrency, I believe that the best time to strike them is gone, yet one can still hold on to their effective retracement from now till the second week in January. I mean around the 10th of the month when the fate of the ETF that caused the present excitement in the market is determined.