In Pathfinder and DnD 3.5, clerics could get two domains. Maybe we should bring that back to DnD 5e. How about a feat?
Dual Natured Cleric
Your god has favored you, and you represent more than just aspect of your god. Gain the following benefits:
- Increase your wisdom by 1 to a maximum of 20.
- Gain an extra domain. Every day when you pray for spells, you gain the choice of taking spells from either domain for each level provided by the domain. For the channel divinity, 6th, 8th, and 17th level features, you must choose one from either domain to gain for the day for each feature.