I think, ETH and BTC have significant future growth potential, but they have different characteristics and roles in the crypto ecosystem. Ethereum is well-known as a platform for decentralized applications and smart contracts, while Bitcoin has become the most famous and largest cryptocurrency. The growth of both will be influenced by factors such as technology development, use cases, competition, external factors and institutional adoption. Investing in crypto always involves risk, and there are no guarantees or firm predictions about the future growth of ETH and BTC.
During the rise of the market ETH sometimes grows even more than bitcoin. But when the market falls ETH falls more too. Now the biggest problem of Ethereum blockchain is a really big commissions which make the work with blockchain unprofitable for simple users and developers. And it is very important to solve such problem because now commissions in the blockchain of Bitcoin are smaller then in the Ethereum blockchain.
You are right, The problem of high transaction fees is a challenge facing Ethereum. During an up market, Ethereum can grow faster than Bitcoin, However, efforts are being made to overcome this problem through the development of Ethereum 2.0. With these solutions, it is hoped that transaction fees on Ethereum can be reduced, making them more efficient and more attractive to both users and developers.
The matter is that the more popular blockchain Ethereum becomes the higher are the transaction costs. Sometimes the fees can reach 100$ per transaction. And who will make the transactions on Ethereum blockchain if each transaction costs 100$?