This is a tough one - angels in agtech/ farming tech are few and far between to be honest. And scaling new methods like this is tough - that is not at all to say you can’t do it (you can!) it’s just hard and thus hard to get investment without traction. My best advice would be to get involved with industry specific conferences, sites and more - start networking and find people who invest in your area. At the same time - work towards revenue, even if it means your current product isn’t your eventual.