Yes. Completing the main story in 'The Witcher 3' is just one part of the whole experience. The game is filled with a rich tapestry of side content. There are additional quests that pop up based on your actions in the game world, and exploring these can give you more insight into the lore and characters. You can also engage in activities like horse races, Gwent tournaments, or simply admire the beautiful landscapes. So, there's plenty to do and discover even after you've seen the main story through to the end.