I do not know if its feasible in Egypt, but crowdfunding might be suitable approach to find funds for establishing independent scientific journal via donations on national level or via crowdfunding online platforms on international level, where Egyptian diaspora can participate with donations. Online crowdfunding platforms are Kickstarter, Experiment.com or Patreon. Other ways to get funds for the work are Sponsorships – Partnerships with scientific societies or private sector sponsors, Subscriptions – Revenue from library or individual subscriptions if not open-access, Publication Fees (APCs) – Charging authors article processing charges, especially for open-access publishing.
I believe the answer will depend on whether you are seeking funding for the existing Egyptian Journal of Botany or for establishing a new journal. Have you discussed that matter with the Egyptian Botanical Society (the publisher of the current of the Egyptian Journal of Botany)?