How do you build as support?

I play support a lot but since the revamp in support items 2 decades ago I don't know what exactly to go for. On the one hand I see redemption or Zeke rush a lot of the times but after that what to do? And how do I get CDR in a tank support? It feels like the only good option is glorious justice but it's so expensive and if I don't go for it I'm left with even more expensive tank items that I can't really build either send help.