Dropped positions after removing junk pages, shrinkage?

Question

Search Engine Optimization

Greetings.
The site had 900 pages in the webmaster, in fact 400 (posts).
Removed all junk pages (hid from indexing) and the traffic fell twice.
The question is, does shrinkage occur after such a "shake"? Will the traffic return?
Indeed, in theory, garbage pages did not receive traffic, they simply clogged the search (links to a page with an embedded image, the engine created its own page for each image)

Answer 1

Well, maybe they weren't trash. So there were visits on the bass