If you lose faith in ETH and feel that in the future you don't make any more profit from ETH then you should sell to buy BCH or BSV, but I see the pumps for BCH, BSV will probably make many people lose when buying now. The future still exists and ETH will still grow, please be patient.
Ethereum is a long term investment and cannot go up well during this time because Vitalik does not have much new information for everyone here. I think if you choose to invest in BCH, BSV, the risk will be very high because these two coins have risen very high prices and certainly next time there will be a big adjustment so be careful. Personally, I believe in the potential of ETH because this coin is considered the best technology coin in the market.
Beside, a lot of big investment funds are holding this coin so this year ETH may soon reach $800 if altcoin season comes back and investors are interested in choosing to invest.