It is only one-sided procedure.

• You can change your topic from self-moderated to non-self-moderated by Moving it to Meta (Meta board does not allow self-moderated topics), then move it back to the initial board.
• It's impossible to change a topic from non-self-moderated to self-moderated. It is helpful to prevent scammers to turn their topics to self-moderated and censor user posts or inquiries about their scam projects.

If you are not scammer, but want to make a topic as self-moderated, do as above users suggested: Pin a last post in your initial topic, direct posters to your new self-moderated topic and lock an initial one.

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