Lau declared his candidacy in the 2018 New Territories East by-election, a seat left vacant by localist Baggio Leung of Youngspiration over the oath-taking controversy. He claimed to have received Leung's endorsement and did not participate in the primary organised by the pro-democracy camp. He also declared that he no longer supports Hong Kong independence. He also resigned as the convenor of the Community Network Union and ran as an independent localist. After the end of the nomination period, Lau's candidacy was disqualified by the returning officer on the basis of his previous support for the idea of Hong Kong independence.