In this wave of decline, I have seen several well-known KOL bloggers shouting to buy at the bottom and saying it is the last chance to get on board. What do you think, brothers?

I personally think that buying in batches is never outdated. If you have already fully invested, then you should pay for it. If you have not fully invested, you should at least half the position, because the next market will have a big positive line of more than 20cm at any time!