You can move your IMDb activity into Cinephile by exporting the CSV files from IMDb and importing them from Cinephile's import section.
Before you start
Sign in to your IMDb account in a desktop browser before exporting. IMDb provides separate CSV exports for ratings and watchlist items, so you may want to export both files if you want the fullest migration possible.
Congratulations! You're completely free from IMDB and are now ready to continue your journey in Cinephile. Enjoy!