Not a feel-good power fantasy, not a feel-good power fantasy, not a feel-good power fantasy!
Standard synopsis: Zhao Chen transmigrates to another world and discovers he can evolve plants. From then on, he embarks on the path of farming and cultivating immortality.
The not-so-serious synopsis: An accident sends Zhao Chen to a world with gods, immortals, demons, strange creatures, spirit beasts, Dao soldiers, fairies, and a few…
Ahem, anyway, this world has everything you could ask for.
He discovers he can refine plants in their mature state into seeds, and even add all sorts of strange things to them. And so:
Ordinary gourds -- Spirit-Absorbing Gourds -- Treasure-Nurturing Gourds -- Grotto-Heaven Gourds
Rice -- Spirit Rice -- Marching Rice -- Dragonblood Rice
Henan beans -- Model Beans -- Puppet Beans -- Dao Soldier Beans
Only then does he remember that, as someone who transmigrated, he doesn't even have a System! In a fit of rage, he builds one himself, only to discover that this is the proper way to begin cultivating immortality.
See how Zhao Chen keeps a low profile (keeps a low profile, keeps a low profile, keeps a low profile) as he takes the world by storm in another realm.
Build a Daoist sanctuary, train Dao soldiers, grow spirit plants, tame spirit beasts, and marry a fairy.