how to get off hotspot back to normal

On the device generating the hotspot go to Settings->Personal Hotspot->Allow others to Join, set it to off.

On the connected devices, simply turn off Wi-Fi or connect to a different network.

Settings > Personal Hotspot.. or Settings > Cellular > Personal Hotspot (my phone has both paths), turn off the toggle switch 'Allow Others to Join' so that it does not show green