I did not have this but the NIH says it is always recommended to have a short course of a bisphosphonate upon discontinuing prolia. I believe but not positive that Reclast, mentioned by @gently is one. I am sure my doctor would have mentioned it but my prolia was stopped abruptly during the pandemic as the seats became fewer and the chemo infusions were more important (rightly so).
I know I am taking my chances with a fracture but I do my best with diet, supplements and exercise.
Are you comfortable talking to your doctor about this?