My good sir, thank you for listening, first of all, it means so much that there are people out there who have the capacity to listen to an 18 m piece of music.
i agree that the music lacks the adventurous feeling, harmony, and rhythm changes, I guess that is where I need to improve. you see, the Italian baroque is very flat, meaning that you have a lot of melodic sequences and the harmony is a bit in the key, which is hard to explain over text ;D I have a lot to improve... its my first cantata after all.
if I will write a cantata again I will implement the tips you have provided me, I will listen to your music gladly.
thanks again.