I'm a fan of t-bills. Most of them are currently well over 4% and state tax exempt. I've been buying the 8 week ones for a while now. But the 27 week ones are pretty close to 5%. But the 8 week seem to be the sweet spot between being reasonably liquid and a decent rate. The downside is that when they start dropping they tend to drop much faster than the banks. But when that happens you just don't reinvest them.

https://www.treasurydirect.gov/auctions/announcements-data-results/

There's plenty of HYSA accounts as well. Sofi seems to be one of the highest currently but they have all been slowly going up over the last few months.