Here is my tip :
List all your name on Sedo and Afternic as soon as you can with high BIN price (not too high if you don't want your potential buyer run away).
If you are luck, buyers will click " Buy Now" and you get your money.
If not, your domains will be displayed on their search results once they searching on Registrar platform to buy/reg their wishing domain. And they know that your name is ready for sales. But your price is too high, they will try to contact you via Whois or type the domain in their browser and access it. Now, this's time for Efty Landing Page. Keep your Efty Landing Page as " Make offer" mode.
They will try to fill in Make Offer form, then you reply with your own price ( of course lower than BIN price on Sedo or Afternic). So your buyer will think that they can negotiate to get the name with lower price. Selling a name or not in this step depends on your negotiation skills. That's it.
Of course i just start using Efty Landing Page this year (before using Efty, i used my company 's landing page with Make offer mode), and just list my portfolios on Sedo/Afternic for 7 months, but i got nearly 60 passive offers total in 9 months. My portfolio was just 80 names in the early of 2017 and 750 names now, in which i guest 100 are junks and i will let them expired.
If you or other fellows have more tips to get more passive offers, please share. We can try and fix
.