Since July 3, 2020, the 470-608 MHz and 614-616 MHz bands and a portion of the MHz duplex gap (657-663 MHz) are legal for unlicensed users. You can also use the 902-928 MHz ISM band, the 1920-1930 MHz band, and portions of the 2.4 GHz and 5 GHz ISM bands under specified power levels and rules for operation for each band. In addition, the VHF frequency range for wireless microphones of 168-216 MHz is available.
If you have a wireless system that can tune outside of those frequencies, even if you do not tune your mic to them, they have been decertified for legal use in the USA. You can check with your wireless microphone manufacturer to see if your decertified systems can be updated.
FCC Wireless Mic Rules: