Generally speaking, few people can copy the bottom accurately. Those who can copy it are all luck. You all know this premise, so our operating space is generally on the left and right sides of this bottom.
The picture is drawn casually. There are many bottom shapes, this is just one of them. It is not recommended to carve it.
It can be seen that because the bottom position is uncertain, the left side needs to buy in batches multiple times, which means that the left side purchase has high requirements for capital allocation ability and the fundamentals of the underlying asset. At least it is highly likely that it will not return to zero while buying. At present, in my narrow understanding, only Bitcoin can be bought on the left side of the crypto market. All other currencies will have a greater risk of returning to zero after entering a downward trend, especially DeFi currencies that may cause on-chain stampedes.
The stop loss on the left is not so fixed, it may change with the indicators used in personal trading strategies, the most common example is that if it falls below MA120 or EMA200, the left side buy will be stopped and the stop loss will be stopped. Some have no stop loss, such as the Martingale strategy.
At the same time, buying on the left side also means that traders need to extend the battle line, because no one knows how many times they have to buy in batches before the official breakthrough. The specific length of the battle line depends on their own trading level, so they must be mentally prepared before starting the left side trading.
After the breakthrough, it is the right side of the transaction. The advantage is that the flexibility is better and the stop loss is clearer. You can choose whether to trade in a short period of time or hold for a long time depending on the market situation. Although there may be a false breakthrough/failed breakthrough, thanks to the existence of a clear stop loss, you can leave the market in advance and look for opportunities, thus avoiding excessive floating losses.
Whether it is the left or right side is purely a matter of personal preference and trading style. I prefer the right side, but for Bitcoin I will occasionally participate in left-side trading at a large level.