Congratulations on starting on your hosting journey, @Alysha38 ! And also congrats you've already got Superhost, that's a great thing to have!
I'm not sure about the market in your area, but it is unusual in all my years of hosting to get a booking that's more than 3 weeks out. The majority of my bookings are made during the week for the upcoming weekend. Only extended stays or special event stays get a lot of lead time. So I don't think your booking situation is out of the ordinary. Once you've been hosting for a year you'll get a better feel for the trends in your area for the seasons. (e.g. we barely get any reservations in the winter, except on Thanksgiving and New Years weekends)
I would consider it a blessing you haven't had a pet stay yet! Much harder to clean up after and does put more wear and tear on your space. My listings specifically don't allow pets for this reason. People booking with pets may also be looking for listings that aren't apartments for the very reason that allowing pets there is rare. I see the picture with the astroturf patio, which is great. You could add another photo with a pet bed and toys, if you have them... but honestly unless this is something you are very keen on doing, I would just keep the pet friendly flag on but don't promote it.
This is your "money shot". I would retake this photo at the same time of day (because the cityscape lighting is amazing), but turn the lights on and get more of the bed/pillows in the photo so its clear that you could lay there and look at this view. Then I'd make this the cover photo! Also I would suggest retaking the living room photos as well because it looks a bit dark. The rest are great!
Lastly, I would reformat and edit your description a bit just so I could read more of it without needing to expand and bring the highlights to the top! :
"Luxurious inner-city apartment opposite the iconic Queen Victoria Market. Free tram (transportation) just across the road with easy access to explore all Melbourne has to offer! Perfect for a couples getaway with amazing city views from the king size bed or private balcony. Building has a pool and workout room with free access."