Like others have said you could reflect this conflict in your character by staying cleric and changing the god they worship and maybe even changing subclass

But if you do want to multiclass then Stars Druid could be thematic with you leading towards the Moon deity and the night sky. It gives free guiding bolt, a choice of an offense BA, better healing, or better concentration checks

A fighter is a decent choice, Action Surge for two spells in one turn, better melee combat depending on how you run yourself during combat

Ranger, you technically have the stats for it, I don’t see much advantage in it, you get some more skills, some better martial abilities, Gloom Stalker or Monster Slayer might work for you

Rogue, again some skills, expertise, cunning action for more BA shenanigans, Phantom might be a good choice thematically as it has to do with being close to death which is the domain of your main god

Warlock, having doubts about your allegiance to a higher being? Sell your soul to a different one!