Im not a big shitposter but 4chan was actually a decent source of information and help, there's stuff posted there that'd never get mentioned elsewhere and its just convenient not having to sign up to 500 places and wait days if not weeks for replies.
It's not 4chan itself that matters as much as it going down sucks, sites always have and will go down and thats okay, the real problem is that its a trend, its not 4chan thats dying but what it represents, its one of the last of its kind.
Overwhelming majority of forums have been shut down long ago, those that remain aren't really used and keep shutting down, UK just pretty much wiped out all the indie sites based there for example, there is just no place for anything that deviates from the new norm now, non-algorithmic, non-corporate content/services and therefor their users and content are not allowed to exist anymore.
The corporations/governments/advertisers/investors won the internet, the war has been lost long ago we're just unwilling to accept it.
There is already so much less to do online, give it a few more years if nothing changes what will be worth going online for? Just within this one month, 4chan down, Skype shutting down, Twitch purging the video backlog, Origin shut down (lost 100 games moving to EA Desktop). Most forums already dead for years, before they backtracked Google wanted to delete old YT videos, it will happen sooner or later still, obviously YT has been nearly unusable for over a decade as far as new stuff goes, if anything good exists on algorithmic platforms to begin with they make sure its impossible to find, everything new is spyware, censored to all hell, mobile first/only locked down trash, nothing genuinely worth bothering with.
At this rate I do not see what will remain by the end of the decade, sure a few places will probably survive on tor or something that some people will manage to find, but that aside, you either get with the program, get a smartphone, start watching the vertical algorithmic cancer, submit ID to go online, enjoy the 24/7 surveillance and advertising or get left behind (which is the much preferable and less likely option we're not gonna be lucky enough to get), message is clear, the times up, if you're not the type the above sounds appealing to, too bad, you'll get with it no matter what, else at best you'll starve if you don't submit to total top down control.
Bet someone is already typing "touch grass", well thats the point, soon enough if nothing changes that will not be a thing online or offline, thats what everything starting to require a smartphone, apps, QRs, social media is for, if most people continue to not only put up with but actively encourage this there will be no way out.