Hello Singularity,
First you have to address your low oxygen level. 92 is too low.

From Web MD: “Low oxygen level, also called hypoxemia, is considered a reading between 90% and 92%. A reading this low means you might need supplemental oxygen or that there may be challenges that affect how your lungs function.”
https://www.webmd.com/fitness-exercise/how-to-increase-blood-oxygen-level
I understand your suffering. I was there with extreme fatigue, muscle aches, breathing problems and brain fog for 1.5 years. I prayed for guidance and now I am doing well and I wish to share what I have learned to hopefully help others.

Some over simplified basics: Our muscles are made up of tissues that are made up of cells. The cells need constant recharging to create energy, similar to rechargeable batteries. A constant resupply of oxygen to our cells is needed in order to create the energy.

Here are excerpts from an article by Medical News Today:
“The study shows that when the mechanism that releases nitric oxide from the amino acid binding site in the hemoglobin is working, the blood vessels dilate and allow oxygen-rich red blood cells to flow into the tissue.”
“Essentially, blood flow cannot autoregulate (increase) without nitric oxide.”
https://www.medicalnewstoday.com/articles/292292#Implications-for-blood-transfusions-and-the-nations-blood-supply
The key factor to get oxygen into our cells and tissues is the ability of our bodies to produce nitric oxide. The body naturally produces nitric oxide as the end product of a conversion process of dietary nitrates and vitamin C. One of nitric oxide’s functions is to relax your blood vessels, which improves blood flow and oxygen supply to our tissues.

Obtaining sufficient nitric oxide (NO) takes a constant focus of how we can increase NO by consuming vegetables / supplements with nitrates and avoiding what decreases NO.

We need to consume vegetables with nitrates and have vitamin C from citrus or supplements. Some of those vegetables are beets, kale, spinach, bok choy, celery, cocoa, honey, broccoli, cauliflower, and carrots. Add citrus, like orange slices, to get your C naturally.

The supplements are L-Arginine and L-Citrulline that create NO. They can be taken together, but limit to 9 grams total per day. I take between 3 and 8 grams per day depending on my level of activity / exertion. Remember to take them with vitamin C.

Good luck! Side note: We resided in the Upper Peninsula for a decade. A beautiful place.