Where is the league renew button now? I can respond to the warning message, and that does work, but I no longer see it independently.

I wish I could answer now but I renewed my 2 teams before the forced switch. I imagine it's on the team homepage, upper right. Should you end up losing your teams in my leagues when the season flips, please reapply and/or send me a PM and we'll get you back in.

It shows for me under My Team in the menu. But only if we're nearing a certain point later in the season. Once I've clicked it and renewed, it's gone again.

So, I can't see it because I've already done it? That makes some sense. It's not very reassuring, but okay.

If you want reassurance, look on your team page under abandon this team

Had the same concerns when making sure i had renewed for next season prior to EOS.
I'll find out where the renew link is tomorrow, hopefully easily.