It's understandable that you feel more comfortable investing in well-established cryptocurrencies like Ethereum and Binance Coin (BNB). These coins have a strong track record and are widely recognized in the market. However, it's important to note that there are many other legitimate altcoins with potential for growth and returns.

While investing solely in Ethereum may be a good strategy for you, it's always beneficial to diversify your investment portfolio. Diversification helps spread your risk and can potentially increase your overall returns. It's a good idea to explore other altcoins that have strong fundamentals, a solid team, and a clear use case.