The fastest way to underprice social media work is selling it as posting instead of a system. A package with strategy, a content calendar, short-form video editing, community management, and reporting can easily be worth $1,500-$3,500 per month for one small business because it replaces several separate roles. If you are writing captions, designing assets, and analyzing performance, you are not doing $400-a-month assistant work.
Capacity usually breaks on content production before anything else. A client who wants 12 feed posts, 8 reels, story support, comment moderation, and monthly reporting will often consume 12-20 hours per month even with templates. That means one underpriced retainer can block out room for a better client, so track time by deliverable type and raise rates when video or approvals start dominating the workload.
Tie pricing to business outcomes whenever possible. Audience growth is nice, but leads, booked calls, store visits, and lower cost per acquisition justify better retainers than vanity metrics alone. Monthly reports should show what moved, what did not, and what the next experiment is, because strategy is where social media managers protect margin and earn trust.