Best DPR using the Horizon Walker’s teleporting feature?

I am hoping to play a 20th level character in my new campaign. We are starting from level 20 and using a homebrew progression from there.
What is the best combination my levels, ASI, feats, magic items, etc, with the optimization objective being to maximize Damage Per Round(DPR). Multiclassing is permitted.

Restrictions

The Character requires at least eleven levels in Ranger(Horizon Walker) to use its teleporting ability.

Books

  1. All official WoTC books allowed
  2. Unearthed Arcana allowed
  3. Anything RAW allowed
  4. All magic items available – but only one artifact, and two legendary items
  5. No wish/wish-granting
  6. An answer including setup, and optimal buffs from another player, is helpful, but only as an extra – do not rely on the others for damage
  7. Aim for consistency – things like Wild magic surge aren’t good