The arithmetic explains why. Organic reach for a business page now sits at a small single digit percentage of followers, which means a business with a thousand followers reaches a few dozen people per post. Posting five times a week to reach that same few dozen is not a strategy, it is a habit with a cost. One considered post a week that people actually read outperforms five that nobody does, and it is sustainable, which matters more than any individual post.
Pick one platform rather than several. The most common failure among small businesses is thin presence across four networks, each updated irregularly, none building anything. Choose where your customers actually are, which you can determine by asking your last five customers rather than guessing, and put everything into that one. A dormant account on three other platforms is worse than no account, because somebody who finds it concludes the business is inactive.
What to post matters more than how often, and the useful filter is whether it demonstrates something. Work you completed. A question a customer asked and your answer. Something specific about your market that only somebody doing this job would know. That material is finite, which is fine, because it is the material that produces enquiries. Content produced to fill a schedule reliably reads as content produced to fill a schedule.
Set a cadence you can hold during your busiest month rather than your calmest. Weekly is a real answer. Twice monthly is a real answer. Whatever you choose, the value comes from still being there in a year, and the most common outcome of an ambitious posting schedule is stopping entirely after six weeks.
Decide what you want the account to do before choosing a frequency, because the answer differs considerably. An account existing so that somebody who looks you up finds a business that is clearly active needs very little: something recent, and evidence of real work. An account intended to reach people who have not heard of you needs consistency and volume, and it is a different commitment. Most first year businesses need the first and attempt the second.
Track whether it produces anything before increasing the effort. Ask new customers whether they saw you there, and watch whether posts produce messages rather than reactions. A substantial number of small businesses discover that social media contributes almost nothing to acquisition while consuming several hours a week, and the honest version of that finding is a reason to reduce the commitment rather than to work harder at it.