I have obtained the patent certificate, and now I want to protect the patent. What should I do?

First of all, you need to confirm whether the protection you want to increase is described in the specification of the authorized patent or a new technical point that is not described in the patent specification. If it is the former, your technical scheme has been contributed to the public, because it is not reflected in the authorized claims; In the latter case, only the new technology points are patented, which has not been refuted by the existing technology, so there is an opportunity to obtain the patent right through re-application.