I can imagine your frustration. From personal observation, I have seen many changes, although I still receive 2M impressions and 10,000 repins a month. There are several new things in the works such as story pins which are changing the allocation of impressions. Advertisers also get priority of impressions, leaving less impressions for free. Your best strategy would be to drive activity from the outside rather than make changes to your Pinterest pins, profile, etc hoping to get Pinterest to increase their resource allocate to you.
From personal experience, it you are reporting spam pins on your own group boards, you are only hurting yourself. It is better to delete the pins and ban the posters. If these are pins at large, continue to report them for the quality of Pinterest.
In the bigger picture, reporting pins and your impressions are probably not related. Pin impressions are dropping overall. The new Pinterest structure in which all your pins are consolidated in the first field of your account before your boards, as well as other changes, has altered the search algorithm and diluted the impact of new pins.
After four months, there is finally a sliver of hope on my account. Recently, I've been aggressively reporting stolen pins that are linking to spam sites/affiliates. I think I reported about ~1000. It actually took a couple of days for the spam to be removed due to the sheer volume. Each time I reported them, more spam would take their place. It seemed endless. I just kept reporting it over and over again.
Now . . . you can see my site is now appearing on the search term I showed above. For me this is amazing because my site has never appeared in search on that term for four months. No, it's not a fresh pin. It's an old pin that hasn't been spammed the heck out of. Has this happened for anybody else?
I know it could be short-lived because spammers just have to repeat the same thing over but for me this experiment established a clear connection between stolen pins and my site not appearing in search.
That is a terribly inefficient way to report accounts full of stolen pins getting tons of views. These accounts aren't taken down after filing DMCA claims so they can just generate more spam. There needs to be a better way to fight back because the amount of spam that is ranking in browse and search is just ridiculous.
This is what I do to report spam accounts:
1. Report policy violation > A Spammy account
2. They email back to say that I should file a DMCA complaint
3. I email back to say "this is not a DMCA complaint. I've already done it (insert confirmation # here). This is a complaint regarding a spammy account. Please read my original message again"
Two days later, the spammy account is removed.
My site back in search for another search term after disappearing for 4 months after taking massive massive action of reporting stolen pins. I spent the entire month of September reporting stolen pins with no results day after day, so I can't tell you how elated I feel.
It's so discouraging when you spend hours and hours reporting stolen pins only to see more and more appearing in search. I won't be able to recover all my traffic, but there is hope that I can get at least some traffic. I have so much more work to do.
We are consistent in posting 8-10 fresh pins daily and got thousands of views but this September we only got not more than 100 views per pin and often got 2-5 views. @PinterestGabby @PinterestJanice. Can you tell if our account is blocked by Pinterest or marked as spam? This is really frustrating as our impressions decreased to 80% especially the saves and clicks.