@Allison111I will try to be of help. I can think of a few things that may help you.
#1 - I was also on a many platforms (Airbnb, VRBO and Direct, Trip Advisor, Bookings and others). Think of dropping some, like those that bring little or are a hassle to deal with.
#2- I keep a personal 'Master Guest Reservation Book', so ~instantly~ can see what is avaible and is not, thus speeds my answers. I gave up on trying to keep calendars in sync. A single mistake turned out to be too much of a mess.
#3- Answer quickly but ~briefly~. Your information is already on your site with all agencies. If an inquirer sends you a list of questions that resemble the length of 'War & Peace', STILL answer succintly. You don't have all day. An answer is better than none.
#4- I have become very explicit for who my place is for or isn't, has allowed to take a chance; since I limit guests to 4-5 days, it wouldn't be the end of the world if my guess is wrong, even dead wrong.
#5- Think of raising your minimum stay, to lessens the 'one-day trippers' which are a lot of work, and hurt your shot at longer stays.
#6- Accept the fact Airbnb IS presently leaning toward guests, not host, but that will change. Life. There is a reason why they are so succesfull, and the amount of guests they bring many of us is indeed VERY fortunate. In fact, these ARE the best of time, when Airbnb goes public they will do less than they are doing now, much less.
My case: I went to 'slots' of 4-5 days, (a minimum of 4 or 5 days) the ~same~ slots show in every calendar (Airbnb, VRBO and Direct). A slot is taken, goes immediately in the Master Reservation Book and I visit the calendars in VRBO and my Direct web site, to block out those dates.
Good luck.