I started volunteering with my local Weed Warriors group. We tackle invasive vines and bushes that kill native trees and block out the understory for native plants. It’s really satisfying when you liberate a tree or rip out an invasive bush. I like the exercise and social connection too. Search to see if your community has a weed warrior group or other conservation group that does field work. They can have a training/certification program. Some improve hiking trails too.