Trying to force 1000 followers in 3 days organically is honestly difficult unless you already have distribution somewhere else. The fastest approach is usually combining short form video, community engagement, and cross platform leverage instead of only posting normally on Facebook. I would focus on one highly shareable piece of content tied directly to emotion, controversy, or usefulness, then push it through relevant groups, creators, existing users, friends, and other social platforms rather than chasing random followers individually.