Its development isn’t discontinued, there are some alpha releases of the new version: Releases · LawnchairLauncher/lawnchair · GitHub
Hi, did you read Prepare Lawnchair 11 for F-Droid support · Issue #1473 · LawnchairLauncher/lawnchair · GitHub first?
KISS launcher is nicer imho 
Agreed. Also, it does not look like Lawnchair is going to do anything anytime soon, irrespective of the issues/deliverables, etc.,
KISS Launcher is best currently. I used to use OpenLauncher, but it has been literally abandoned for quite sometime with no new releases.