What happens when my Sim completes their Lifetime Wish? Can I choose another wish?
Sims can only have one lifetime wish. They can switch wishes using a lifetime reward, but once completed this option is gone. So, your Sim can only complete one lifetime wish, ever. Completing the wish will give your Sim a massive boost to lifetime happiness points, and give them a mood boost for a day or so. So, other than the points there’s no real bonus.