Talk to General Physician on Vitamin Deficiency - GP/Physician/MOs

I am 24, male, weight 57kg, height 5,7.

I had vitmain D deficiency. The report showed 9 ng/mL. I took 200,000 IU fortnightly for 2 month which is 4 tablets on physician recommendation. It ended 2 months back and i haven't get it checked again and don't feel like visiting labs due to corona. I still feel deficient as i feel tired. What dose shall I take for vitamin D? how many tabs IU per day/week is normal? PS: I have sedentary lifestyle, work from home hence i am under sunlight 10 mins a day only

Also please recommend the dose of multi-vitamin Serbex-Z. How much of 300 mg tablets shall i take in a week? PS: I take CaC-1000 once in two days