The best place to get interest on USDC and DAI are defis or decentralized farms. You'll comfortable get 9-18% on most platforms without any issue.
You need to keep your keys safe and access it in safe environment and you are in full control of your coins unless the platform you are staking has loopholes or rug to pull. (Which are rare these day due to multiple audits.)
You get better rates than centralized exchanges. Other centralized platform like NEXO might seem easier but with the example of Celsius, I'll recommend everyone to avoid such centralized platforms.