I am not an ideal person to comment as I have never attempted to write orchestral music and am just an old piano improviser. Neither have I ever bothered with theories as I have little interest in sounding like music of the past. However, as nobody has replied, I feel any effort in a creative direction has to be encouraged. The question is really how you yourself feel about your music. Does it say what you wanted it to say ? Does it, at least to your own ears, surprise and delight ? Does it propel you to reach out in new directions ? Other people, however well intentioned and knowledgeable, cannot answer these questions for you or tell you which notes to play. That is at once the joy and onus of any artistic creation. I suggest you continue to create your own music, whether through improvisation or composition, piano or orchestra, simply because at seventy-seven I know the internal rewards of doing so grow with age to far exceed those of just playing other people's ideas.