Tastyworks
is one of the most reliable brokerages, alongside Interactive Brokers, as unlike most other brokers they've never restricted trading of volatile stocks or equities during for example the $GME viasco of 2020/2021 -- while most brokers halted trading prematurely before they were legally required to or had to for some other reason, Tastyworks only limited trading when they were unable to fulfill orders due to exchange restrictions outside of their control.