I am building offline my new e-commerce website and I am facing a big problem.
My "old" and current website has more than 9000 pages indexed for merely 500 products (yes I know... I chose a bad solution...)
70% of my traffic comes from Google and 10% comes from my website name (the rest is coming from small keyword)
The new website has clean pages with a total of about 400 pages.
I don't know how to make the transition between the old and new one.
I don't have the time to redirect 9000 pages ... but in the same time I don't want that Google discover 8500 pages that are 404 when putting the new website (bad for seo right...?)
So I have yet to find a solution,