There are plenty of things you can do to help with the effort.

• Pick any open source project an contribute to it.
• Pick an open source project maintained by an Israeli person or company.
• Participate in the activities of one or more of the local communities.
• Help with the organization of events. (Monthly meetups, conferences, hackathons, etc.)

• Encourage your co-workers to contribute back to the open source libraries you use at your workplace.

• Organizing communities (WhatsApp, Telegram, Facebook, Meetup).

• Top GitHub committers in Israel.
• Contribute to open source projects.
• Get your company to contribute to open source.

OSDC, The Open Source Development [Conference | Community | Club | Course] provides materials to help teach employees or students to contribute to open source projects.