Unfortunately, it is unlikely that this problem will be solved in the foreseeable future. You probably noticed that the prices of cryptocurrencies are not controlled by the demand and the community and the big players, the same big crypto exchanges and investors. Based on this, they are unlikely to give up the opportunity to constantly make a profit, both with an increase in the price of cryptocurrencies and with their fall. To solve this problem, it is necessary that there are no large holders, and the cryptocurrencies themselves are distributed as much as possible around the world. Then the price may appear and will depend on the value of a particular cryptocurrency.
There will always be large holders, this is not NFT that you can limit what people are doing or how they are profiting. This is why I believe that we should definitely focus on making as much profit as we can and hold as long as we can and ignore all those whales and manipulators. Sure it is a hard thing to achieve when you see your entire life savings go down 80%, but if you do not wait then you can't make a profit.
Let's assume you had 10k, and bought at 20k during 2017 December period, wrong move? I do not think so, and the price went to 3k, so your 10k became 1.5k dollars, lost 85% of your entire life savings and you should sell it before it goes to zero right!! Well wrong. If you waited and sold at the top, which is nearly 70k, then your 10k would have turned to a little close to 35k dollars. So forget about manipulators, and forget about panic selling, in the long term you make a profit.