The first that you need to know is that a 780 credit score is considered to be very good and there is not much room for improvement. There is nothing much you can do in order to increase your credit score rapidly and radically.
The second is that all creditors have a certain threshold for approving credit. While this threshold differs with the each creditor it seems more than likely that your credit score well qualify for it. This means that you are not likely to face problems getting further credit when you require. Creditors also have a threshold beyond which they offer the best interest rates and credit terms possible. If you are already getting the best interest rates that a creditor has to offer increasingly credit score will not reduce them any further.
If however possibly send you still want to enhance the credit score you can try and increase the limit of credit available to you on a revolving basis such as your credit card limit. You can then subsequently charge a lesser amount which will increase your debt to limit ratio. This is one of the factors that affects your credit score. The higher the utilization ratio the more your credit score benefits. But any case even this is not likely to make an astronomical difference.
The best thing to do is manager finance as well as you probably have been doing so far. Your credit score take care of itself.