Hit the wisdom soft-cap and then balance mana/wis gear depending on what gives you more.
Some items are very cheap for the mana gains you get. Pearl Kedge Totem for example. I recently spent about 12k bumping up my cleric. No raid gear here at all; some of those cheaper items are still in play. Toxigen's list is really solid.
https://wiki.project1999.com/Magelo_Blue:Chapman