Have I been clapped?

During the recent June spam update, my site started picking up a lot, but this was likely due to me finally starting to crawl out of the sandbox combined with good backlinks. However on June 26th I seem to have peaked, and things started drastically going downhill, my rankings started dropped massively. At this point I don't think this can really be natural volatility anymore, and I believe I've been penalized. I haven't received any notification from Google though. I went through the spam update post, and the only thing I really could resonate with is keyword stuffing, where some sentences could read unnatural because I tried to fit in keywords. Could that really cause this drastic decline? I've changed most of the content on the site to fit their new guidelines, but it seems I just keep going down. I've also disavowed some toxic backlinks, and manually removed a few in case those were the bad actors, however I've had most of those for a while.