I’ve been using CPAP since 2000 and have tried dozens of masks, nasal pillows, chiropractic care, dentists, acupuncture, biofeedback. Finally found a good mask and machine that works fantastic for me. https://www.google.com/search:
Some adjust to using the machine sooner than others. For me I stop breathing 139 In 3.5 hours. So I noticed a difference immediately. We kinda get addicted to breathing. My doctors had me start by using the machine while I was awake in the evening for hour before bed. Adding a few min each night over 1 week then try to fall asleep with it. That helped me a lot.

Good luck!!
Dawn