I dont think that now is a good time to sell. Now it is better to buy.
Bitcoin and Ethereum now overvalued that is why investors are looking for new and prospective projects for investment to invest money on their seed stage and have a maximum profit from investment.
Only small investors are trying to find new projects to invest in, thus ignoring the really successful projects like Bitcoin and Ethereum.
Because from what I see there are still so many investors who like Bitcoin and Ethereum so they never hesitate to put their money into Bitcoin and Ethereum at this time.