Study and CPAP.
Didn’t help that we were sleeping in a double bed so I was basically snoring in her ear, but I e now been using CPAP for over 8 years and both of us are getting solid sleep. (Until recently but at least it’s because she was pregnant and now because we have a newborn).
I was and am quite a bit larger than you, but size isn’t the only factor with apneas. 🤷♂️
You will appreciate sleeping without snoring almost as much as she does.