Hi there i am interested to know how can one improve your images rankings on Getty's website. Does sales improve the ranking which means it will be a harder task for someone whose image appears on page 52 of the search.

Sales used to help, but there must be other factors nowadays. I've had three files in particular which went from averaging over a sale a day (this is good for me, shocking for others) to virtually zero because of sinking in the best match algorithm.
I'm pretty sure there is nothing you can do about it. (That was iS (this is a microstock forum), however, I see no reason to imagine Getty is any different - I see no pattern in how my files are ranked there.)
Possibly submit subjects with fewer than 52 pages?

Guess the algorithm got us all wondering. I got some images that is on their first page but others are sunk below. As a buyer i cant see myself wasting time going through all the pages. On another thread someone suggested productivity could also play a role these days, like uber's algorithm here locally favours drivers who works more.

Yeah, productivity could be a factor.
In the old days, when iS's algorithm changed, it was usually more than easy to work out what the factors were - often recently uploaded files got a short 'boost'.
Probably a good proportion of buyers don't look past the first page or two. Certainly on Alamy, I notice that some buyers only look at 100 files (1 default seach page), but others look at over 2000 - or more, with a very general search term. Maybe the latter are looking for lots of files for e.g. a book.