I believe I sent you several links 3 to 4% a year is your risk and my risk and everyone else in our situation.
Normal approach to follow up for someone who had F3 or F4 prior to cure of hep c is abdominal ultrasound every six months along with blood testing for CBC, Liver panel, and INR
watchful waiting
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5677038/
https://www.hepatitisc.uw.edu/go/treatment-infection/monitoring/core-concept/all
https://www.aasld.org/sites/default/files/2019-06/AASLD_2018_HCC_Guidance_on_Diagnosis%2C_Staging_and_Management_hep_29913%20%281%29.pdf