There are loads of varying numbers out there on recommended vitamin D levels. Some take into account gender, age, and medical benefits. Others just provide general ranges. Those ranges not only vary withing the U.S., but are also between countries. It's all so confusing.

I did my best to find info on BMD specific levels, and found two sources that may be helpful.
The first is an article in the European Journal of Clinical Nutrition from 2020 titled Vitamin D deficiency 2.0: an update on the current status worldwide.
https://www.nature.com/articles/s41430-020-0558-y
It specifically reference levels needed for good bone health.

The second is a 2019 randomized clinical trial in JAMA titled Effect of High-Dose Vitamin D Supplementation on Volumetric Bone Density and Bone Strength.
https://jamanetwork.com/journals/jama/fullarticle/2748796
After having extremely low levels when I was diagnosed with osteoporosis, my personal goal was to achieve and maintain a level of 70-100 ng/mL. For me that required high does of D3 supplementation in tablet form.
Here are the results of my labs from 2022 to now.

After taking 5000 IU per day of a vitamin D tincture for more than 5 years
November 2022 - 19.5 ng/mL

Switched to 5000 IU in tablet form in January 2023
May 2023 - 29.8 ng/ml

Continuing at 5000 IU in tablet form
November 2023 - 45.4 ng/ml

Increased dosage to 10000 IU in tablet form in December 2023
April 2024 - 74.6 ng/mL