A scheduler makes posting everywhere possible, which is not the same as making it wise. Cross-posting is cheap; being present is not. Presence means replying, watching what lands, and posting things that suit the place.
How to choose, in one question
Where does the person you want already spend their attention, and in what form? Not where is the growth, not where is everyone — where are they, and do they want pictures, video, or words.
A reasonable shape
- One network where you actually show up — post, reply, watch
- One or two where the same work is cross-posted with a light edit
- Nothing else, until the first one is working
The cost nobody counts
An abandoned account is worse than no account. Somebody finds it, sees the last post was eleven months ago, and quietly concludes the whole thing is dormant. If you are not going to keep it, take it down or say so in the bio.
Cross-posting earns its place when the extra network costs you a few seconds. It stops earning it the moment it costs you attention the main one needed.