While interest rates stay high, so will returns on money market fund investments. A simple investment account (likely available from your current bank) with everything put into a good MMF should bring 4+% right now, and is less likely to have withdrawal frequency limits and definitely won’t have a term length like CDs.
At Chase, they’ve got a solid MMF option that’s been over 4% for a few months and has same day liquidity, meaning it’s basically cash even though it’s getting interest. I think it’s the lowest risk, highest convenience option currently.