Scarcity thoughts after success

In 6 months, I have achieved my impossible goal money-wise. Celebrate!
As a result, I have doubled my goal.
But as an under-current I feel that I was too lucky, will not be able to be able to repeat it and I get scared that I will not have enough in the future.
Scarcity is grasping my mind.
What can I stay in the positive and on track?