Does anyone know an organization or business hiring entry level gardeners or know where I can volunteer?

I’ve always liked gardening. I’m from New Hampshire and had a nice raised garden bed I built and grew tomato’s and I’ve worked landscaping jobs before but I want to learn how to work on beautiful gardens. Even if I have to volunteer at first. Does anyone know where I can learn more about gardening by actually gardening, or know anyone that would hire? I’m a capable 34 year old man, I just really love the outdoors and plants, trying to know everything about them. Weird request but worth a shot!