I’m thinking that many sitters who have families, jobs, or very limited travel budgets are probably only able to complete 1-2 sits per year, or maybe not any. As such, the $129+ membership fee may be too high to justify the value received.
My first suggestion: For sitter members signed up to auto-renew, on the renewal date if they have had zero sits in the past year they get 50% off their next year. Members that have completed only one sit (7 days or less) get 25% off their next year. This will encourage people to keep their membership even if they couldn’t find sits to fit their available dates, acceptable travel distance, etc., or if none of the sits they applied to selected them. I’m guessing this will net THS more money in membership fees by encouraging people to stay subscribed and keeping people feeling like they got decent value for their money.
A second suggestion: if a sitter is the ONLY applicant, and the HO confirms that sitter, the sitter should get an $X credit to their account toward their next renewal. This does two things: First, it makes the less attractive sits a bit more likely to get at least 1 applicant; that makes the HO happy because THS worked for them. Second, it makes the sitter happy because they earned $X for taking an unpopular sit. It could be worded something like this: “You were the only applicant for your upcoming sit at ____'s place. As a special thanks for helping ____ successfully find a housesitter, TrustedHouseSitters is crediting your account $X. This means your next membership renewal will be $X less! Enjoy your stay!” When the membership renews, include a note again about the discount they received.
THS could do a similar credit for sits that are new and have zero reviews, to encourage people to apply to unreviewed listings and increase the number of applicants that first-time HO’s get. “This is the first time ____ has listed their home on TrustedHouseSitters, and you were their perfect match! As a special thanks …”