@georgetakei Having been through and watched a number of social media shutdowns and/or failures, one frequent (though not universal) theme is the platform fights its users.
In the case of Google+ and several other shutdowns, efforts to archive content by both individual members and organised groups such as #ArchiveTeam (/me waves at @textfiles) had archival efforts blocked or otherwise frustrated.
BizzLightfear here apparently sees peoples' expressing Exit (in the Exit, Voice, Loyalty) dynamic as a thread, much as the authoritarian heads of Communist states in the 20th century did.
Pity that.
As a practical action: Once the decline of a platform has become clear, your best course of action is to make your exit immediately, to an extant and viable alternative, and to limit any ongoing posting to informing others where you've gone.
You should also sort out how you want to dispose of your content, whether that means archival or deletion. #InterenetArchive can help you with the archival bit, see:
"How to archive your Tweets with the Wayback Machine"
https://help.archive.org/help/how-to-archive-your-tweets-with-the-wayback-machine/