If we're asking you to rebuild your home, it is to fix an issue that your game currently has as it's in a bad state. Sometimes if you continue playing in this bad state it can cause the app to crash and reset all the app progress which we definitely want to avoid. When you rebuild your home the house and furniture will be deleted but your purchased packs will still be available so you can rebuild and redecorate. You can demoilish and rebuild your home by clicking the blue build hammer in the Home Designer district, clicking the red "x" underneath the house and then dragging it to the trash.
If we've asked you to manually reset your app, it's because your game is stuck in a bad state and the issue (and other issues!) could continue to occur. While resetting your app will mean all the progress you've made in your world will be reset, but any purchases that you've made in the app will still be there. Also, while the progress in the app is reset, any characters that you've created with the Character Creator will still be there (and looking as they should), and any gifts you've claimed should be on the Post office shelves.
If we've asked you to manually reset your app, it's because your game is stuck in a bad state and the issue (and other issues!) could continue to occur. While resetting your app will mean all the progress you've made in your world will be reset, but any purchases that you've made in the app will still be there. Also, while the progress in the app is reset, any characters that you've created with the Character Creator will still be there (and looking as they should), and any gifts you've claimed should be on the Post office shelves.
We often advise players that have had their gifts go missing (usually if there's been a corruption or crash) to manually reset the world, that is if they don't mind the progress being reset in the game. If you've uninstalled/reinstalled your game, however, it could be that your gifts have been lost and there's no way for us to bring them back. Players start the game with all the gifts from 2018/2019, however, so there'll be a ton of fun items to get playing with again.
You can manually reset your Toca Boca World app by pressing the red reset button on the start screen.
We hope that helps to reassure you a bit, but let us know if you've got any other questions!