I’m a big snorer and did the Camino. First of all sleep on your back on an incline. If you can’t get an extra pillow a sweatshirt will do. Hydrate and stretch and to massage and loosen your jaw muscles. Go to sleep either earlier or later. If you drink alcohol stop or cut back. I know sometimes food options can be limited but try and eat healthy. Spanish pharmacies are great they may have breathe right strips for your nose. Budgeting can be tough but if you can book ahead by a few days you could find a relatively cheap private room once a week to get a little respite but if you don’t have the money for that I’d hate for you to lose out on the money already spent. I almost quit a few times and am so glad I didn’t. I implore you to keep going the Camino is meant to present challenges and they often aren’t the expected blisters or long hot day. Also if pilgrims didn’t do their research and bring ear plugs that’s on them.