Easy mode: If you are in the US, try looking up the Savannah Institute. They do some fantastic work to develop and research regenerative agricultural practices

Easy mode: If you are in the US, try looking up the Savannah Institute. They do some fantastic work to develop and research regenerative agricultural practices and they can use your money :-) Medium mode: Find a motivated young people that want to start a regenerative agricultural enterprise. Support them in some meaningful way. Agriculture will need to be changed from the bottom up to some important extend and that needs capital and other input. Access to land is expensive and farming involves a lot of bureaucracy both issues that you are probably well placed to support with. Hard mode: Become a farmer! You don't need to cultivate 300 acres to be one. Find something (chickens, nut trees, bees, peaches, etc.) you are passionate about and that fits into your local context, spend a year or two to become an armchair expert, visit 10 other people already doing it and then get a bit of land and do it yourself. Depending on what you choose, a decent sized backyard can be a serious farming enterprise.