If you are extremely late into btc, should we not try to get more BTC by selling top and then buy double after crash?
Let me put it this way - anyone who adopts BTC over the next 10 years, will not be "extremely late". Rather they will be extremely early. (This will only be apparent in hindsight). Do not try to time the market, buy/sell, hope for a dip before buying etc. Buy in now, HODL, and keep buying, regardless of any short term volatility (either to the upside or downside) Simple.