Point being, the time leading up to this vote is probably be the best time to let your congress members know your opinion on NN. Do not let the "failure"[1] of previous efforts to get congress to act in defense of NN dissuade you from future action, particularly now: It is far easier for a politician to take no action (as they could when the FCC was ones doing the voting) than to actively vote against the wishes of their constituents.
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[1] Failure in scare quotes since it seems likely part of the reason NN is still a topic being actively fought for in congress, in the courts, and at a state level is because there is a large amount of vocal support for it.