Mera bhi 90mbps tak jaati hai

You can see difference between jio 5g sa logo vs airtel 5g nsa

I think Only some flagship phones support vonr or vo5gFor now only 2 or 3 flagships(samsung) support vonr that to via ota update.

Don't hesitate, i hope u have done lot of tricks,Lastly just turn on and off aeroplane mode.

If u r not a 5g user turn off 5g/4g/3g/2g set to 4g only.Set Screen timeout to minimum.Do a single long charge instead multiple short time charging.Use power saving mode.Turn off gesture features .Use adaptive refresh rate.