Here's some historical data to put things in perspective. Ethereum has still outperformed Bitcoin in 2021 even with BTC @ $60,000. This is why looking at the big number is not the overall picture. Your return on investment would have been bigger for Ethereum.
Cardano is even more pronounced.
I would put my money into Bitcoin if it outperformed these other assets.
Now that being said yes you can hop from one crypto to another to increase gains. If I knew how to time the market perfectly I would sell all my ETH to BTC, ride it up and once it mellows out sell back to ETH and ride that up. But it is tough to time these things. And it complicates your taxes.
Ethereum Open Price:
Jan 01, 2021 737.71
Mar 14, 2021 1,908.64
Increase: 158.724973228%
Bitcoin Open Price:
Jan 01, 2021 28,994.01
Mar 14, 2021 61,159.55
Increase: 110.9385697253%