I recall some initiative (in Africa, iirc) where locals would collect seeds of random herbs, shrubs, trees etc, mix those up & pack into seed bombs.

Then others who travel around for their work, would toss those in random places. From bicycle thrown some distance from roadside, or a bush pilot dropping some during flight, etc.

Basically as many different seeds in as many different places as possible. Then let nature do its thing.

Note this was still mostly local. So not introducing invasive species from other side of the globe. Just helping native species to spread a bit further & faster.