Hi @Ben-and-Emily0
Some advice (I work in marketing and communications)
You need to rewrite your headline something like 'Secluded garden retreat, in Tetbury, Cotswolds' so you have the town you live in, in your headline and also the key benefits of your space; secluded, garden, retreat'
You are wasting the opening pictures you have on your listings. Your first image is a dull grey picture that doesn't show the bedroom or property.
Swop it for a photo showing the retreat in its garden setting. Make the five top photos work for you, you have two that are the same/very similar. I would have the opening photo of your garden, the shot of the bed with your welcome tray, bathroom and a couple of photos of the local area - Tetbury and a Cotswold open country scene.
I agree get a professional photographer in - what do you mean you are working on this - just book someone to come in this week and give them a brief of what shots you want.
Bottom line you only have forty reviews because you are only open for half the year. Airbnb puts listings which aren't available in the next few months to the bottom of the viewing pile. So either you need to create a heating system that will mean you can open all year -can you put in a log fire or adequate heating or recognise you won't get as many bookings.
Don't forget there are many other platforms you can list on including your local tourism site.
Good luck.