How Low to Cycle Before Surgery?

I’m having an elective surgery. Currently my red blood count is too high. Thick blood. So there is a danger of blood clots. Obviously I need to cruise and reduce my red blood cell count. My question is how low can I go on test cyp and still maintain The mass I have. I am a TRT patient, however I Blast and cruise. Currently running 500 mg test a week and 500 mg deca. Need to end this cycle for surgery. I’m 6’4" 300 lbs 14% bf.