(a) if one is overweight, losing weight helps

(b) Adjustable bed bases help

(c) check with a sleep medicine provider to check for sleep apnea and cpap machines

(d) new drugs [1]

(e) see whether breathing exercises [2] help

[1] https://news.ycombinator.com/item?id=48242278

[2] https://news.ycombinator.com/item?id=48242278#48243574

Although others have mentioned losing weight, weight might be a side effect of a medical condition (e.g. type 2 diabetes) or social pressure (e.g. communal dining) which makes controlling diet and eating schedules very difficult.

I went because I had a deviated septum and thought that was the cause of the snoring but he said that’s unlikely if the snoring only started recently.

Exercise. Any kind of exercise, from strength training to walking.

The diet-and-exercise cliche is a cliche because it effects just about everything about us. It may not be the only factor in snoring. Or even the dominant factor. But I'd bet the house it's a factor.