Darkmoon Faire is back for a week and aside from Profession Quests, you’ll want to take the +10% buff before completing any content that gives Loamm Niffen reputation.
Get a Darkmoon Top Hat, so you don’t have to go back to Darkmoon Faire to receive the +10% reputation buff.
With the buff active, go to Zaralek Cavern, and complete World Quests and outdoor events that grant reputation with the Loamm Niffen. If you saved up any reputation tokens, you can use them while you have the buff for increased reputation.
10% is not much but it’s at least here to help you reach Renown 20 faster.