do not act rashly, you should do your research before selling everything. are you really sure after the merger will experience massive sales. But what if it's a start for ETH to reach a new ATH and rise slowly.
In 2021, Ethereum is showing a positive trend by experiencing more than one all time high. I am sure that with the changes made by Ethereum, the price of this crypto will increase gradually in the future because Ethereum is still the main choice for investing in crypto assets. I hope that the momentum of The Merge can be used by crypto asset traders to make a profit. Because in the future it will potentially increase.
Currently, it is difficult to make a decision. If he sells all his Ethereum and then it does not have any massive sales, he will regret the decision. The probability that ETH will increase after the merger is higher than the dumping. He seems to be going against a lot of people, I see a lot of investors buying into ETH and hopefully with this merge happening, they will then be distributed a coin forked from ETH and this is the free profit. I think this option is better than selling ETH and buying it back later, it's too risky.