There are not any "real" investment projects where you can earn interest, passive way.
Bitcoin price has furiously gone up in recent years, so investing in BTC is an good and profitable investment.
There is exchange that provide BTC futures and leverage trading.
But, I am still waiting for legitimate financial provider or good exchange that will provide options based on BTC.
Options are also leverage-based instrument, but less risky than futures.
While investing, do not put everything into one basket, into one egg (even if it's golden egg).
Diversify. Diversify. Diversify.
Invest in crypto that are backed by good product, service or backing fund.
... do not invest in "empty" crypto coins that are mined in hundreds of millions, then pumped ....
and abandoned.
Amen.