Being aware of your instance admins stances and what they plan to do. Bit rich coming from my kbin account (no idea the stance), but I have two other accounts already on instances where I‘m certain the admins wouldn‘t sell out to corpos. So if kbin were to federate with Meta and their stuff invaded my feed, I would move to one of those as my primary account.
What I think is going to be important here to make this less of a pain for users who get very attached to their accounts, is some ability to export and import account data, comment history and so on. I personally don‘t care (deleted a 15 year Reddit account without a care too), but I want this to succeed and for that it would be important.
Once this influx has died down and the devs got some more room for requests, I hope they can give us this ability.
Now before anyone regales me again with "Why not give them a chance, companies are our friends" stuff, I‘m gonna link a few things to read for you instead of replying to me, cause I can‘t be bothered to argue with pro-corporate people anyway and won‘t respond: