Once you reach 1000 points and claim the grand prize, completing additional tasks will no longer increase your progress in the reward bar. Tasks may still be available, but they won’t add any more points until the next cycle.
However, you can still earn regular coins and various small rewards, such as items for the furnace, by completing daily tasks.

The reward bar resets every 7 days, and in the new cycle, you’ll have the chance to start earning points again from zero. You can see the remaining time until the reset at the top of the screen.