The problem with this is that, even though the Facebook Page was simply mirroring the content on the blog, most of the interactions with actual bands and fans was via the Facebook page, not the blog. I don't really know if the blogpage itself has the same readership; if anything it's the other way round: I'm worried that with the Facebook page gone, people won't know to find the blog. And with the page deleted, I have no visible way of informing my subscribers either.
I did create a 'backup' page on Facebook (here: https://www.facebook.com/Metalised-Life-112985154608128) and announced the hack to people on the 'main' page, but the main page was taken down before people subscribed to the backup. Annoyingly, this announcement was part of the same post announcing the 'best of 2021 metal albums', which got many upvotes and replies from the bands and fans involved, but it's almost as if nobody noticed the part about the hack and the 'backup' page in the post...
Reddit has a couple of popular metal subreddits, etc.
Open a quick forum and work on it, build SEO articles, ask people to share articles on other pages, and grow your community double the one you had on FB instead of despairing and worrying about stupid upvotes. Best of luck
In addition, while you should keep looking at ways to recover your FB page, but you may want to take this opportunity to create a more traditional forum of your own.
You may want to look at AVSForum.com, Home-Barista.com and others for ideas on how to structure very successful traditional review/forum sites and while it may be more effort initially as you'll have to build it yourself, in the long run it may be more fruitful for you.
Either ways, Good Luck!!