I have around 2k USD of btc and I wanted to swap it for something but I can't decide whether to buy eth or Solana both seem extremely promising in the far future.
Since you are planning to invest your $2000 in Ethereum and Solana coins, in my opinion both coins are better to invest. This time Bitcoin price set a new record before the Bitcoin halving. Solana and Ethereum coins pumped well due to the hype of this Bitcoin price increase although they did not break their past records. Solana in particular pumped up a lot, Solana went above $200. If the bull season begins after the upcoming Bitcoin halving, the price of Solana and Ethereum coins will be increase significantly even they enter new highs in value. So I think holding 70% in Ethereum and 30% in Solana will give good profit in future.