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We can't use not so in the sense of not very. The expression He's not so rich implies a comparison: He's not so rich as you are.
If we are speaking of a near and immediate future time, we must use presently, immediately, in a minute, or soon. Just now refers to present past time, and not to future time: He's not at home just now (= at this moment). He left just now (= a little time ago).
Hard means severely. Hardly means not quite or scarcely: The baby can hardly walk.
At present and presently are not synonymous. At present means now, but presently means soon: She will come back presently (= soon)