Ideas and suggestions.

By the way, a brilliant suggestion was made here: why bother with restructuring when you could make the appearance of Dimension Door and Teleportation spells mandatory, at least in the second guild built? That is, if they don't give it to you in the first, they guarantee it in the second. You could even make it so that spells don't repeat in built guilds (if possible). P.S. However, on the other hand, this seems like a workaround. And the intrigue of searching for control is lost. At the moment, of all the suggestions I've seen, the simplest and most optimal remains this: when you click on a spell in a guild, it offers to replace it with another (previously unopened) for a certain price (money + resources). (Perhaps it should be allowed to replace no more than one or two spells per day.)