@Mi26 I can't tell what changes you've made, but when all else fails, sometimes the best thing you can do is wipe the slate clean and start over with a fresh new approach.
As a starting point, try putting yourself in the mindset of a prospective guest. Imagine you're planning to visit Malta for the first time. You don't know much about the place yet - but you're attracted to the rich historical architecture, the beautiful scenery, and the pleasant climate. You don't have the budget for a luxury hotel, but it's your first time traveling after a miserable year under lockdown, so you want your stay to feel really special. You want your rental to be a fun part of your experience and not just a bed to crash in. So you pull up Airbnb and do a search to see what's available. (Go ahead, plug some dates in and do a search) . And wow even as soon as next weekend, there are a lot of appealing choices available. Look at the first photo on each search result and consider, which ones would you click on? The ones with colorful antique interior design? The sun-splashed rooftop terraces? The leafy gardens? The scenic views? The refreshing swimming pools? The cut-rate boutique hotels (currently a steal at 50 EUR per night)?
Or does the photo that first catches your eye happen to be one of a brown bed and a trash can against a sad, empty white wall with the curtain closed? Is that the picture that makes you think "this would be a much more delightful place to stay than the others"?
I'm guessing not.
But OK, let's say you really like hosted homestays, so despite the depressing lead photo you click on it anyway. The next thing you see is a list of rules and a blurry toilet. Wow, what fun. And then some nice photos of the common areas of the house, but relaxing in the kitchen or dining room is "strictly forbidden." And there's a pool, how nice, but you have to reserve it in advance and observe a strict 30 minute time limit - this sounds about as delightful as a trip to the dentist. And while the description promises friendship and company, it's unclear what kind of interaction will occur, and with whom. And then there's the preponderance of cats. So you find yourself wondering how this is more appealing than a hotel room which is actually cheaper and more conveniently located?
OK, end of hypothetical traveler story. @Mi26 I don't know what kind of places you personally like to stay since you have no reviews as a guest, but the joie de vivre that's apparent in your beautiful library, garden, and dining room seems very much the opposite of what you're offering in the guestroom and the hospitality experience. If you want to have more success in hosting, I'd strongly suggest that you take your listings down for maintenance. Re-do the drab room design to bring more passion and beauty, re-shoot the photos to be more appealing in search results, and replace the confusing listing description to give clarity about the complete experience of hospitality you're offering. And don't re-list until your listings are all so enticing that if you were the traveler, you would choose them over all your main competitors.