Evenity can be continued for two years and will continue to benefit bone density according to this report.
https://pubmed.ncbi.nlm.nih.gov/29694685/
The report is based on a study of patients who received Evenity for two years, followed by Prolia after completion of 2 years of Evenity. The report says that bone density continued to increase throughout the the 2 years of Evenity and continued to increase during the following year of treatment with Prolia.

I reviewed the study about continuing Evenity for two years with my endocrinologist.

My endocrinologist wrote me an email that says the following: "Based on the current knowledge I would not favor proceeding directly with a second year of Evenity, but rather switch to an anti-resorbing drug. Having said that, a second Evenity course in the future is a reasonable option. Another alternative is to switch to a cyclical form of therapy, with intervening short courses of Evenity against a background therapy with anti-resorbing agents."

I would appreciate thoughts of anyone who has experience related to this.