Generative models models are still a relatively new development in machine learning research, and new techniques are developed frequently.
A good starting point for coming up with new ideas will be to follow ongoing research by studying research papers and other publications. You may find inspiration for novel techniques by transferring knowledge from related fields. Another approach could be to try to apply methods that have been developed for one application to other use cases.
Generative models are still in their infancy, so there is certainly a lot of room for improvement and possibilities for applications.
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