another point is, if I switch SA does that mean I am back to zero ?
It's really frustrating that your SA doesn't remember you despite shopping with her for a year, spending a significant amount of money, and giving you advice that she isn't able to follow-up on.
If Dubai H is like the US, there have been an influx of customers who have also started shopping at H in the past year or two, much like you. Your SA can't keep up with everyone, and likely the store isn't hiring SA's fast enough and stock is always low because H is can't scale up production for handmade bags quickly and supply-chain issues. Your SA probably comes to work daily with dozens, if not hundreds of calls and emails every day.
None of this is a good reason to not remember customers who you've been working with for a year, but hopefully this puts things into perspective. It's plausibly not your SA's individual fault, but H's fault for not scaling fast enough, or doing enough to help customers.
I'm not familiar with how Dubai H works. I can see that for some countries they weigh different spending differently, and in some cases do not count covetable bags like Lindy that in the store's opinion, "might sell themselves".
It might be best to switch SA's since you can't even book an appointment with the current one. This is just my opinion from reading this forum: if it's the same store, your past purchases might be considered by the SM but the SA is the one that actually asks the SM to allocate the Kelly for you. So you likely will need to spend significantly with your new SA, but hopefully your previous spending will not be entirely disregarded by the SM. I've seen in this thread that sometimes you can request to speak to your store's SM - maybe this helps with making sure your previous spending is somewhat considered? This is speculative advice.
That being said, it'll take some patience even with a new SA. From reading this forum, while the H shopping environment could improve, spending x amount will not automatically guarantee you a bag, let alone the specific Kelly you are hoping for.
It's definitely not an ideal shopping experience for anyone and I wish I could directly put more pressure on corporate to serve customers and alleviate individual pressure on SA's. I hope corporate is taking their feedback from their SA's and SM's who must be complaining that they are having a hard time and customers are unhappy.