Cadenza

It's sometimes necessary for any human being to stop riding on the routine of life and wait some seconds in a stop somewhere in the middle of the desert of his lonliness to find out what he has been through and what he is gonna do later. Some things or some ones in your life are just a pace away from you, like you have had them all through your life but you never gonna find out what happens if this one pace turns to two paces. When they are close you are thinking about so many things but you don't realize it's their presence that provides such an ambience for you to even think!
It's true even in music.Sometimes a long pedal note makes you so unaware of what is going on at the back, but when it stops you start to hate the whole piece because of that emptiness or maybe you just mention it as compoer's inability. That's life too.
So in my opinion try to keep the ostinato and enjoy improvizing on it cuz it's all like JaZz!