Green card through marriage shouldn't take 3 years, more like 3-6 months.
I hate so say it but 600 TT is not enough.
Charter (135 IFR ) requires 1200 TT and 500 XC
Large corporate (Flexjet, Netjets etc) several thousand PIC.
Small corporate whatever their insurance requires.
Most Regionals have several hundred furloughs
Majors are not hiring and usually require a couple of thousand hours jet time.
Get as much time on your present job as possible prior to moving.