Cellular boosters generally can't boost the "good parts" of 5G networks. AT&T and Verizon carry a small amount of 5G on the old cellular bands 2 and 5. Boosters handle that, so a booster may summon you a 5G icon, but that signal doesn't give you an experience that's much different from 4G. The fastest 5G networks for AT&T, T-Mobile, and Verizon are currently on bands n41, n77, n260, and n261; no consumer boosters support those bands reliably. There is a sneaky way around this. Although no powered boosters work with these bands, passive antennas can still improve the signal. They may only get you 10dB to 20dB of gain as opposed to 70dB, but that isn't insignificant (and even just the fact that the antenna is outside can help). If you are willing to take on a bit of an installation project, the Waveform's Griddy parabolic antenna and MIMO panel antennas improve signal on the 5G band n77. Connecting an outdoor cellular antenna to a Wi-Fi hotspot that has a TS9 connector, such as the Netgear Nighthawk M6, can also turn an outdoor cell signal into an indoor Wi-Fi signal.