My memory of details is vague but since no one else has chimed in:If this is is ending soon, any LN/WN readers got me with the quick fire story spoilers on how the whole spirit tragedy thing ends?
There's no magic workaround for Euphie's state; the drawbacks of being a contractor are real. But some stuff they run into interacts with Anis's dragon magicite and makes her immortal too, so she can probably keep Euphie emotionally grounded indefinitely. They intend to accomplish key tasks and then abdicate and run off at some point, rather than remaining as immortal god-queens. I forget if anything has been said about succession.