In 17 January 2019, Nima Lepcha also joined HSP,and he was appointed to the vice president of it. After a week, 24 January, vice president Bina Basnett was nominated to the president of HSP. At the same time, Bhaichung Bhutia and R.B. Subba became acting presidents. In same month, HSP held tie-up talks with Sikkim Krantikari Morcha and Bharatiya Janata Party for the Sikkim Legislative Assembly Election 2019. But HSP had not been able to form any alliance with other political parties after all. In February 2019, R.B. Subba, K.N. Upreti, Tara Shrestha and 4 other leaders seceded from HSP. They explained the 3 major reasons for quitting from HSP, namely nomination of Bina Basnett as the party president, ‘unauthorised talks’ by Bhaichung Bhutia with other political parties and differences over the Limboo-Tamang Assembly seat reservation formula. In addition, they insisted that 80% of party workers of HSP favored to nominate Upreti as the party president. Subba, Upreti and Shresta joined SDF. In March same year, Indra Hang Subba and Tirtha Sharma also seceded from HSP, and they both joined SKM. At the same time, Indra Hang Subba was nominated to the candidate of SKM for the sole Lok Sabha Seat from Sikkim. In contrast, Athup Lepcha, Nima Lepcha, Dhan Singh Limboo, Biraj Adhikari and some other leaders favored to Bina Basnett and Bhaichung Bhutia, remained with HSP.
In the Sikkim Legislative Assembly Election 2019, HSP nominated 22 candidates to 23 constituencies. But all candidates lost and only received 1.76% votes or less in each constituency. In Lok Sabha Election of Sikkim, HSP nominated Biraj Adhikari as their candidate, but he lost and secured only 1,998 votes and the 6th position of 10 candidates. In October 2019 HSP participated the By-Election for Sikkim Legislative Assembly. HSP send candidates to 2 constituencies, namely Bhaichung Bhutia recontested from Gangtok, Nima Lepcha recontested from Martam-Rumtek. Before this election, HSP proposed a pre-poll alliance to Delay Namgyal Barfungpa, but Barfungpa didn't accept it. In Gangtok constituency, the candidate of BJP, Yong Tshering Lepcha elected by 2,508 votes, and Barfungpa became a runner-up candidate by 1,498 votes. The candidate of SDF, Rinzing Ongmu Bhutia secured 874 votes and 3rd position of 6 candidates. Meanwhile, Bhaichung Bhutia secured 579 votes and 4th position, and he couldn't refund his deposit of candidacy. In Martam-Rumtek constituency, the candidate of BJP, Sonam Tshering Venchungpa elected by 8,204 votes, and the candidate of SDF, Nuk Tshering Bhutia became a runner-up candidate by 2,054. Meanwhile, Nima Lepcha secured 1,235 votes and 3rd position of 6 candidates, so he couldn't refund his deposit of candidacy, too.
