I think BTC and ETH are already too expensive, and the more expensive they are, the higher the transaction fees will be. It is better to look at the potential for coins that are cheaper, and good for the long term such as BNB, LUNA, SOL, or other coins that have good fundamentals.
Ignoring BTC and ETH can also be a mistake because you can avoid this cost problem by buying USDT which you can then use to buy BTC and ETH, but for other popular coins it is still very good to have because not all have BTC and ETH will use a network of BTC and ETH when making transactions, because it can still be tricked very well now.