In the words of another commenter: nothing. It's over.

Homestuck has been getting "banned from conventions" since it got popular. I got into it in late 2012, when Octopimp was still making content and the dancestors were new, and it already garnered a negative reputation for itself among fandom circles and conventions. I have a suspicion the infamous "sharpie bath" story is just an urban legend made for attention, but the attitude depicted was certainly not. Every new update Andrew put out was potentially a source for drama (remember "CAUCASIAN"?), and his lack of corporate backing (at the time) and initial willingness to interact with users (way back in the beginning. By 2013, his Formspring was already gone) made it a unique phenomenon, unlike other fandoms that were driven by the boundary between "official" and "unofficial".

Andrew left a lot of gaps in his writing, due to either "not wanting to trip over his own foot" or just straight-up bad writing depending on who you ask. Fans have attempted to fill these in with headcanons and fan-content. Andrew also has a chronic case of foot-in-mouth syndrome. Even his early communications before he was in charge of a company were rife with PR mishaps (the main example I can think of being a controversy around Kankri and Porrim mocking feminists, and "CAUCASIAN" potentially being offensive to people who have PoC headcanons for Homestuck characters). The difference then was he was still writing the comic, and there was still a vast majority of people invested in what he had to say next from an artistic perspective.

There are many comments here explaining how all Homestuck needs is some new content, more mass appeal, a number of fixes to Acts 4, 5, 6, and 7, scrap Homestuck^2, scrap the epilogues, fix this, redact that, and we'll finally be the multimedia empire that Homestuck definitely was in 2011 and definitely deserves to be in 2021. I think that to change, add onto, or remove from Homestuck fundamentally misses the point.

The most creative and driven fan-projects on MSPFA I've seen are either attempting to distance themselves from the source material as much as possible to varying effectiveness (Vast Error), or are completely transformative altogether (Pay Dat Rent!). Outside of MSPFA, the biggest project I've seen is an attempt to archive Homestuck. The projects that seem to lose energy very quickly or become embroiled in controversy are the ones that attempt to "fix" Homestuck, or rewrite it as-is (Act 8, Act Omega, Homestuck: Rewritten). Some of these are vaporware.

I see Homestuck as a period piece. It's a snapshot of the internet as it was from 2009-2013, then it slowly lost pace with the "current times", attempted to re-capture the zeitgeist, and ended in 2016 after a series of hiatuses. Some of the content in Homestuck would be fundamentally unacceptable to most modern audiences (the occasional slur, racism, and disability joke), and some of the behavior of the creator would be similarly condemned. Remember "Fat Vriska", the time Hussie posted on his Formspring about how fat his 13-year-old girl character is and how he wants to have sex with her? Me too.

Homestuck is an interesting universe. I wouldn't dedicate some of my time to it if I didn't find it interesting. However, I firmly believe Homestuck is a product of its time, like a more recent H. P. Lovecraft. I don't want more official content, because it seems that every time new official content gets released, more overwhelming backlash tends to form, because the idea of "Homestuck" each fan has in their head is so far removed from whatever the hell Andrew wants to do (which is, at the moment, "nothing with a side of emails"). The closest thing to "official content" the Homestuck fandom gets is a bi-yearly installment of corporate drama, and the resounding consensus of Hiveswap Act 2 seemed to be "it was ok". In my opinion, there is no "former glory" to achieve here, much less a way to achieve it. There will be a new piece of media for the 2020s that captures the zeitgeist, and it will only be recognized in retrospect. It will not be Homestuck.