You still can apply for a Certificate of Citizenship but there's a cost associated with it and I really don't think it's necessary or even advisable because you are now giving the government a chance to reassess its previous approval. A U.S. passport is always considered sufficient evidence of U.S. citizenship.
Thanks. I guess that’s a valid point - why invite unnecessary scrutiny.
Especially since the current administration seems to be, er, indiscriminately grasping at low-hanging fruit make some kind of unofficial quota.
If good documentation and good behavior won't protect you, then that leaves trying to avoid being in the front page of search results.
This is a really good advice, actually.