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Everything is carbon neutral on a long enough scale. Unless you send that carbon out to space.

It's carbon neutral on the order of magnitude of a century. If we were to plant a forest in the Sahara, it'll largely be net positive capture for at least 3 decades, and then we'll be able to replace coal with that wood, making a global net zero (but we'd already have reduced co2 in the atmosphere). Replacing oil with wood would probably require quite a lot of work though (as making the desalination plants to make a forest)

Or you can permanently increase the area given over to plant matter

That's a one-time thing though and plants have already naturally spread to basically everywhere that they can spread.

So, for example, we have cleared forests to make way for farmland. Reversing that would increase the total amount of carbon held.

Perhaps I should have said increasing the amount of equilibrium biomass or something to more clearly include rewilding or ecosystem changes. It’s not just plants that are a carbon store, after all.

I don’t think this is likely to represent a full solution, if that is the subtext to your comment.