Btw other alts suggested might be a cheap option but the potential could be more than our top coins if they offer more than just a store of value.
Other options still have a very big room to grow, while the dominance still being hold by BTC and ETH, those outstanding performances coming from other Alts are making its way providing more success from each investors who believes and invest with those assets,
we can't tell how big the market for those progressive assets but if you are willing to hold long enough, those project can give more profits
in the long run.
It's a matter of choosing between practicality and ambitiousness, if you are willing to take the risk, you can play with other assets, but if you are more conservative choosing BTC and ETH still your priority.