Seeing a lot of clicks shows that the copy for your notifications is engaging and interesting to your subscribers. That's great!
But the revenue depends on a lot of factors, sending notifications might not always be enough.
Having a poorly designed store makes a bad first impression. Make sure your store visitors have a great experience browsing your store and have a simple checkout process without too many pop-ups and obstructions.
Another factor could be that your products are priced higher than your competitors. This can dissuade your visitors from buying your products.
You should also assess whether you are marketing to your target audience. Getting 1000 clicks won't mean anything if those did not come from your target audience.
Try out some of the best practices for increasing conversions, once your subscribers land on your store.
Don't give up. Your breakthrough might be just one attempt away.