Be realistic. If everyone said "Late Aug" would people see a high quality server? If the answer is no, then just go about working on stuff. Tease things. Show stuff off. Join discord and discuss. Be prepared for the nay sayers and the occasional guy that comes around after building a decent-ish server years ago to tell you it's garbage. Just put time and effort and you'll get the players that are still around. Bonus points for creating tools that in the end make the experience different as well. I don't think anyone's used it yet, but there's a mining map generator and that would make for a different experience for pretty much everyone.
This is more so I can timebox myself by force. I have problem with going "oh, I will add another thing I guess" and never finish and keep moving goalpost if I don't have a set time. It makes me go into loop thinking I have a few more days til launch so why not add another town.
I don't have much to tease due to that every one here has played modern before.
For tools , I plan to release a web site rpgwo CMS, and bunch of event scripts, for open source use. And some tools for manage and automatic mixing plants/alchemy. Because of how bad and incompatible the existing modern files, I end up also making tooling to import all INI into PostgreSQL database, then be able to export it back out into INI form, to allow for one line changes like "raise all 1H weapon with range below 4 by 1 damage" or "make all SuccessMsg equivalent to 'You create {SuccessItemQty} {SuccessItemName}.'" commands.
I've already sent the cleaned up working V2 ARC INI (for the sake of archival, typo fix, item fix, etc - but no skill, stat, alch, etc. modification) to others.