H1B resets or not in my situation

I worked in US for 4.2 years on H1 and returned to India since past 3 years. My new employer here has filed fresh H1 under cap exempt (and not h1 transfer). I did not have perm filed when I was in US. Will I get full 6 years again as it is a fresh h1b petition or will I only get remaining 1.8 years ?

Reset is applicable in case you maxed out the 6 years H1B term and you dont have an approvedI-140. Also reset do not give you cap-exempt capability, you still have to apply under cap-subject.
In your case you still have remaining period to be claimed as cap-exempt so when your employer files cap-exempt H1B, it should be approved for the remaining. If you intent to extend your H1B beyond the approval period, you will need an approved I-140 or you come back and apply for cap-subject H1B after one year of staying outside of the US.

Hope above clarifies your understanding.