I'm always saying that first it all comes from passion within you. The best idea is to put your personal passion into your business. However I understand that in this question you are asking about the market and I will give you some suggestions.
If you or another person who is reading this have a passion and interest for the food, there is a fast growing market of vegan products. This is billions dollars industry who is not able to cover all the existing needs of the market and veganism in the USA has grown by 600% in the past 3 years.

This included not only food but also shoes, bags and accessories. There are needs for good quality, perfectly crafted purses and comfortable breathable waterproof boots from the other sources than the animal body.
There is a lot of place for creativity imagination and inventions in this field.
People who are not vegan are trying to go to this market because of possible income.
If you are interested in this idea and will discuss this with the mentor who is vegan and who is watching this market for more than 40 years you are more than welcome to call me any time.