Lawmaker Gary Chan has been elected chairman of the DAB, replacing Starry Lee who did not seek re-election.
Brave Chan, Holden Chow, Chan Hok-fung, Ben Chan and Elizabeth Quat are now the vice-chairs.
Speaking to reporters on Monday, Gary Chan said his party used to focus on elections, but the new leadership will try to transform it into a political body that can facilitate the government to bring in policies that are beneficial to society.
"We firmly support the SAR government in lawful administration, pushing for more effective economic development and addressing social issues," he said.
Gary Chan said the party will also serve the country by safeguarding national security, and that it will connect with the international community by telling the stories of Hong Kong and China.
"I feel a profound sense of responsibility and will devote myself entirely to fulfil my duties."
The new DAB chairman added that he would stay on as a member of the Executive Council, saying this could strengthen the relationship between the administration and the party.
He said the DAB will send as many members to run in the upcoming district council elections as possible.
The DAB fielded 181 candidates in the last district council polls in 2019 but only 21 were successful, with the party losing 96 seats.