Perhaps you may find some help in these previous discussions:

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

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

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

https://www.researchgate.net/post/How-to-get-funding-for-an-open-access-Journal-publication

https://www.researchgate.net/post/How-can-I-find-a-funding-body-that-can-pay-the-fees-of-publishing-my-paper-in-an-open-access-journal

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

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

Thank you for your response @ Wolfang R. Dick

Why dont to find out a hybrid journal , publishing manuscripts both through open access as well as conventional publishing .