Vitamin D deficiency

Has anyone else had consistent vitamin D deficiency dispute diet changes, sub bathing and vitamin D supplements?

I've been trying to get my levels up with no success in the very least. My Dr is aware and trying to help but it's just so puzzling to us. I went from taking the 50k unit dose twice a week to daily and now it's up to 3 times a day with no changes in my numbers. The average "low" side is 30 but I'm sitting consistently at a 3. It's been well over 15 months since we started trying to correct it and nothing is helping. Has anyone gone through something similar? Any alternatives to the capsules? My Dr was thinking of trying shots but he can't find any supplier that still carries them 🥴