The proposed method of diversification is good, it is used in the stock market. In our case, it is too early to use this method of diversification, since the market depends only on BTC and ETH. Nevertheless, I like projects related to energy. Here is part of the energy cryptosector: WPR, POWR, MWAT, BWT, SLR. And some shits EDRC, ELEC, and others.
Just BTC consumes energy equal to the consumption of a small country. It is necessary to somehow compensate for such consumption .