At 300 hours, finding a job is very to extremely difficult. At 500 hours and 135.243(b) you can find jobs, often seasonal though. 700-800 you become competitive to PlaneSense and such PC12 SIC jobs. 1200 hours you can pretty much choose what you want to do as 135 IFR PIC.
Either build 200 more hours, or get your CFI.