Hi. I currently have 150 backlinks, 90% of them are dofollow, while only 10% are nofollow. I recently hit position #10 for my main keyword, but now it is dropped to #16 and a lot of related keywords are gone.

So I have a few questions:

1. Was my website penalized for having an unnatural backlink profile (too many dofollow links), or maybe this drop in positions is just a temporary, natural thing?

2. Isn’t it too late for making the backlink profile look more natural by building more nofollow backlinks and making it 50%/50%?

Thank you!