If I were you, I'd look up the potential toxic effects of excessive Vitamin D before you continue that regimen....
FWIW, sunlight is a major source of Vit.D....
We live in Minnesota-impossible to get close to enough vitamin D from sunlight here according to my doc. Their vitamin D gummies are 1000 mg each, I’m giving them two for a month or so then will switch to one. We drink raw milk so it’s not fortified. I was deficient, not just low in vitamin D, kids eat the same diet so they are probably deficient as well.