My wife used Mint Mobile from 2018 until 2022 and really liked it. We moved in 2022 and unfortunately our new place had very poor T-Mobile coverage so we had to switch, otherwise we'd still be using them. She switched to US Mobile which give you a choice of using T-Mobile or Verizon.
They're QCI 7 rather than QCI 6 though, which basically means they're considered lower priority on the T-Mobile network. If there's congestion (not enough network bandwidth for everyone that wants to use it), customers on QCI 6 are given priority. Every MVNO except for Google Fi is QCI 7, while Google Fi and most plans directly through T-Mobile are QCI 6.