Check your state’s secretary of state page. Google “how to change my voting party registration for [your state]”. It was just a few screens for me, a little personal info, took just a few minutes.
I switched to Independent last October, after committee chair Roger Wicker couldn't even be bothered to hold a hearing for a Trump FCC nominee who indicated a willingness to stand up to Big Tech's excesses.
That was the last straw for me.
Dear GOP: Well . . . bye!