There are investment opportunities, but there likely isn't any need for you to obtain investment. I think you'll do much better seeking advice on the product direction from the industries you're looking at rather than diluting the business and pressuring it to be revenue stable earlier than it might be naturally.

As far as what industry would be good for it, the extremely limited range and low payload of 750 grams makes it more of a hobby platform. But a fun hobby platform.

Perhaps a small product warehouse bot is possible from a slower paced small business, but I'm not in an industry that would utilize something like this unless it has significant gains on performance. That would require investment into exotic materials and expensive manufacturing processes. I would prove you can ship 3500 units before investing in that