I didn't realize that you wanted those pages to be noindexed.
We brought it up because from what we can see, it looks like you only have a few pages indexed.
How many pages does Google Search Console tell you they have indexed?
Sometimes content pruning (deleting or noindexing pages) can be good. But it's also possible that it can hurt you if you've noindexed some pages that were ranking and driving traffic to your site. Not only do you lose the traffic they had but you lose their PageRank value to your site and any internal link value to other pages of your site.
Also, you mention that you want to get your site back on track. When did you see the traffic drop? Was it around the same time as some changes you made to your site? Did it coincide with a major algorithm update?