Investors are already witnessing the results of their holdings, with Ethereum valued at $3,190.57, up 15.57% in the previous 60 days, and Cardano, valued at $0.9519, skyrocketing 157.73% over 90 days, at the time of writing. Sustainable development depends on diversification, though, and the crypto market is full of other interesting initiatives ready for exponential expansion. Here are four more altcoins for your portfolio in 2025 if you currently own ETH and ADA.