You can get it from
World Bosses
heroic dungeons
mythic dungeons
random bg’s
storyline
How to earn Renown in patch 9.1 (blizzardwatch.com)
Hopefully your main started off Chains of Domination at Renown 40 — but what if they didn’t? And what about alts? Well, Shadowlands has those characters covered with catchup mechanics. These have been in Shadowlands since the early weeks, but have increased how much Renown they reward in patch 9.1 to ensure characters are flying through Renown levels and earning everything they need.
The first rule of Renown catch up is to just play the game. Doing activities rewards Renown, even activities that don’t normally reward it. Threads of Fate while leveling, completing dungeons, and the callings in the Covenant Sanctums — all of these will reward Renown. All of the new quests in Korthia and the Maw will reward Renown too, if you’re not at the previous maximum of 40.
Additionally, in the new patch, there’s something behind the scenes called, “Rapid Renown Catchup,” which just means that more Renown is rewarded. The specifics are vague, but players should earn more Renown up to 40. Theoretically, bosses that had a chance to drop Renown will drop it more often or offer more Renown than before. This Blizzard forum post has players saying the Threads of Fate quests now rewards three Renown instead just one, and quests for the campaign were giving two instead of one Renown.
The Renown is out there. The only hard part is to not dread thinking about the grind. Blizzard is trying to take out the grind — from 0 to 40 at least, and then putting in the new time-gated grind from 41 to 80. But, really, isn’t that kinda why we’re here — to earn levels and watch numbers go up.
I mean searching the forums first before you posts would have helped you anyways which you should do if you follow the forums CoC .