Consider registering your protocol. Registration helps to promote transparency in the review process and also reduces the potential for duplication.
Many journals require SRs to have registered protocols PRIOR to beginning the screening stage. Check the author guidelines section of prospective journals.
PROSPERO
Use PROSPERO to register systematic review protocols. Note: they will not accept protocols for most other review types.
Open Science Framework (OSF)
Open Science Framework accepts Systematic review protocols and other review protocols including scoping, integrative, and rapid.