ResearchGate may be used as an online repository of your thesis - click "Add new" -> Published Research -> Thesis. See also https://explore.researchgate.net/display/support/How+to+add+research.

If you wish to publish your thesis as a book, see these previous discussions:

https://www.researchgate.net/post/How-to-turn-a-dissertation-into-a-book

https://www.researchgate.net/post/How_does_a_thesis_convert_into_a_book

https://www.researchgate.net/post/I_have_submitted_my_thesis_the_question_is_can_I_published_the_chapter_of_my_theis_in_any_journal

https://www.researchgate.net/post/Publishing-your-thesis-as-a-book-and-also-publish-journal-articles

https://www.researchgate.net/post/Which_is_the_best_publisher_to_publish_the_PhD_thesis

https://www.researchgate.net/post/Who_can_provide_information_on_available_free_of_charge_academic_book_publishers_where_I_can_publish_my_dissertation

But be warned about Lambert:

https://www.researchgate.net/post/Opinion-required-on-Lambert-Academic-Publication-is-it-okay-to-publish-thesis-through-them

Thank you Wolfgang R. Dick for valuable information.

Hello Qanvl Ka

Another idea - which has been mentioned by others in RG - is that you may be able to adapt your work into a journal article (or a series, as your work is probably bigger than one journal article).

Joseph C Lee the work has already published as journal article. I wanted to publish it as thesis to get DOI and make it available on google scholar