Any advice for me ?
If your job truly can be automated this easily, then it was only a matter of time before it disappeared.
Instead of just kicking back and using your "free time" to do whatever catches your fancy now, use this time to find a new job - perhaps one that isn't so easily automated. Or as @DavidSpillett points out in his comment, use this time to learn/improve valuable skills that will be useful to this job or what-ever one you end up doing next.
You knew that you wouldn't be compensated any extra for your unauthorized side project, but you did it anyway. Don't expect that now you can somehow get paid for it - that just isn't going to happen.