On this page of the Assassin's Creed Valhalla Siege of Paris guide, you will find a detailed walkthrough of the Homecoming main story quest.
After completing this task, you will receive an achievement/trophy - Know What is Right.
Return to Ravensthorpe
Time to go home. You can return to England in two ways. The first way does not make the gameplay any less immersive. You can select the option "I want to go back to England" when completing the mission at Pierre's. This will bring you back to the main game map.
However, if you care more about time than immersion, go for the tried and tested method. Open the world map, then go to atlas (triangle on PS4/PS5). This way, you can get to:
When you arrive, you will be greeted by Randvi. If you have a romantic relationship with her, she will give you a kiss. After that, she will ask you about what has been going on. After this task, you will receive the achievement and can continue your fun. You can also return to France at any time.