@Ann783
I recently changed the maximum occupancy for my guest rooms from two to one.
I host long term guests and these have always been solo travellers until recently (although sometimes they have a partner/friend/family member joint them for a few days). Lately, I've been getting more couples wanting to book a room.
I find that if I have guests staying in the other rooms at the same time, it's really just too many people in the house.
I also turned off Instant Book for one of my rooms (the one that's currently booked up for several months) and may do the same with another room and see how that goes. This is because I've been getting far more guests instant booking than usual (used to be rare with long term stays) and the majority of these were problematic and needed to be cancelled.