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As a 501(c)(3), you must refrain from endorsing candidates for political office.
As a 501(c)(3), you must not devote a "substantial part" of your activities to attempting to influence legislation. This includes advocacy and grassroots movements.1
1. Internal Revenue Service, “Restriction of Political Campaign Intervention by Section 501(c)(3) Tax-Exempt Organizations,” IRS, August 20, 2024, https://www.irs.gov/charities-non-profits/charitable-organizations/restriction-of-political-campaign-intervention-by-section-501c3-tax-exempt-organizations, 1.