Supporting got you down? Here's what to do:

Let me guess. Everything is awful because you lost your gold income, you lost Relic Shield healing, you lost your mana regen, and you lost your free CDR, huh? I feel you, but don't fear -- I've got you covered.

1. If you can't play Leona, Alistar, or Nautilus -- chill on the tanky picks for now. If you can't apply pressure to the enemy team by existing in lane with some sort of easy-access engage and defensive steroid, you should avoid playing tanks for now, since current Relic Shield is kind of a troll
2. Invest in AD Poke supports. Yes! Champions like Varus, Ashe, Kha'Zix, and Pantheon can support, and they can do it well with the new item! Champions like these all benefit from Lethality and have tools in their kit to actually support their ADC! From Grievous wounds to free vision, all of these champions can put a damper on the enemy team -- especially since they're poke-oriented in a bot lane that has less healing!
3. Buy Refillable Potion if you're having trouble with sustain. Simple, buy the potion, take less total damage every time you walk back into lane. Alternatively, you can run Inspiration with Biscuit and Time-warp Tonic, which is also useful.
4. On your poke mages/ADs, take Comet and MANAFLOW BAND. Manaflow Band is so important when you're having mana issues! It won't completely fix your problem, but it'll help get you closer to the place you want to be!
5. if you opt for an AD support, rush Umbral Glaive! AD, CDR, Lethality, and the ability to knock out opposing wards is huge when it's cheap. 5.5) If you opt for an AP support, look into Luden's Echo! Its components restore mana on level-up and you get 600 of it when you buy the item -- as wll as stronger poke, faster poke, and your wonderful Luden's proc! It's a little pricey, but worth it.
6. Speaking of cheap, maybe look into Future's Market? I know it shares a spot with Biscuit Delivery, but Time-Warp is still around and you can still use that with refill. Future's Market for the extra gold to hit your usefulness spike is nothing to scoff at.
7. Take CS in the mid/late-game if your team mates aren't going for it. Their loss -- you need items too and it's better the gold go to you than to your minions