A need for AT&T’s network is about the only scenario in which I think staying with Boost Infinite makes sense. It’s relatively easy to find quality alternatives using T-Mobile’s or Verizon’s networks but not so much for AT&T’s network.
Good2Go Mobile (with whom I have no experience) has recently revised their plans and offers a choice between AT&T’s and T-Mobile’s networks. My understanding is one needs to explicitly request an AT&T network SIM.
I briefly used H2O Wireless to test phone compatibility with AT&T’s network before launch of Republic’s 5.0 plans back in December 2021. I had no issues with H2O Wireless but their reputation for support isn’t stellar.
Red Pocket offers a choice of AT&T’s, T-Mobile’s or Verizon’s network. I used Red Pocket years ago. Support was hit or miss.
Probably the best choice in terms of support for AT&T’s network is Consumer Cellular if one is OK with their marketing niche. 