Ability to store more than 9999 crystals/clusters

Hi

When doing big projects like submarines for solo FCs you end up needing to collect *A LOT* of crystals, way beyond the limit of 9999 for each individual one you can hold. It would be nice that instead of being limited by that amount of you and your retainers you could simply overflow that amount into your actual inventory so you don't have to go gather more.

Thank you

Not sure why you'd need more than 30,000 of a crystal at any one time, but irrelevant.
Other than hiring another retainer, what you can do is put crystals/clusters on the market board at a price that's unlikely to sell.
Not ideal, but between two retainers you can store an additional 400,000 in that manner.