One-shot paladin

Im creating lvl. 20 oneshot oath of devotion paladin and i can have 1 artifact, 2 legendery items and 2 very rare items and i can have only 3 attunment items, just need help on some good things to boost my paladin, i will be the main tank and close combatant.

Also what build would you reccomend? (Spells, feats, race)