A method that I personally use to earn some passive income is to arbitrage between your local currency and Tether or some other stable coin. It usually gives you 1% return in every 2-3 days. That's more than what you can earn from staking. I'm an Indian so I personally use WazirX exchange to buy USDT when the price is low and I sell it when I get 1% profit. If you're not an Indian, you can still use this trick on Wazirx. Just deposit your crypto on Wazirx, Buy USDT and sell it in INR form and repeat.