First of all, you have to practice consistently. By consistently, I mean you have to try not to skip even a day without practice of some kind. Even only 30 minutes will do, if you don't have more time available. Of course, if you are really serious and want to become a world class organist, you will have to find more hours for your practice.
The next thing you have to do is to develop your organ technique. Your finger technique and your pedal technique is best developed by playing special exercises like Hanon exercises and scales and arpeggios either on the piano or on the organ. You can develop your pedal technique by playing pedal scales and arpeggios regularly.
Another thing you have to do is to build up your organ repertoire. If you only know 10 pieces, then you most likely will be able to play only one organ recital. Keep in mind that you cannot become famous and a renowned organist if you only have just enough pieces for only one recital.
You have to be able to play hundreds of organ pieces so learn new pieces every single month. That will give you much more flexibility and variety and your organ concerts will be much more interesting for organizers.
The next thing you have to be persistent and persevere in your organ practice. You cannot be an organist who simply gives up whenever he or she meets an obstacle in their way. You have to overcome any challenge, any obstacle in your practice. Give your best effort and stick to the plan.
Finally you have to have goals. Without the goals and exact steps to achieve these goals you cannot reach that level when you are famous and renowned organist.
Consider my recommendations, apply them in your practice and with time you will be able to reach your goal.