2. As of January 1st, 2021 all domains in Buy & Sell must state a selling price or a starting price for make an offer.
For "Make an Offer" you can set your price like this:
Will consider offers above $10,000 (this way members know what to expect).
3. Leave your domains in the Showcase Domains forum if you are simply waiting for an offer
You can ask [notify]Nafti[/notify] or [notify]MapleDots[/notify] and they can move it to Showcase if you just want to leave it as Make Offer.