LTE doesn't work after attemp of fixing hotspot using ADB
Try resetting your APN first

You can revert your APN type to default to remove the dial up networking feature i.e (dun) by this method:


On your phone, go to Settings → SIM card and mobile networks 
Tap the entry for your carrier (or SIM card in question) → Access point names.
Scroll down to APN Type and replace,dun at the end (so the it should say default,supl,mms, or whatever was there).


Or just tap on your SIM card option → Access point names → Reset to default

If you do not see a change, then I'd suggest you reset Network settings:

Settings → More → Network settings reset