After his return home, being a polyglot and intellectual and having a patriotic family background, Kosturi joined the Albanian irredentist circles in the Manastir Vilayet.

He was a member and bookkeeper of the "Dituria" (Knowledge) society founded in Korçë, and led by Orhan Pojani.

[3] In 1909, he participated as representative of "Dituria" in the Congress of Elbasan, where it was decided the opening of Shkolla Normale e Elbasanit.

[7] In 1922, he signed the order for expulsion of Greek Bishop Iakovos (an opponent of Albanian Orthodox Autocephaly) from Korçë.

After the suppression of June Revolution and rise in power of Ahmet Zogu, he went in exile and joined Noli's KONARE (Revolutionary National Committee).

As a chairman, he declared as "void" all laws and legal act approved during 7 April 1939 and September 1943.

[citation needed] When the future Albanian Prime Minister Rexhep Mitrovica was voted in the Parliament, he proposed the Assembly to declare National day of mourning.