Here's an Idea I had for the game, You don't have to implement it, but you can if you choose too.
Mana Compression Suits, or M.C.S. The idea is you have a store in the City that is selling Outfits that can Compress your characters size, Making them smaller, But with a Max-Mana Debuff with better M.C.S.'s using less mana, so that you can grow bigger without having to worry about the issue of growing too big for the gameplay.
the weakest M.C.S. could set a height limit of fifty feet and an asset size limit that is large but not completely ridiculous, maybe 15ft assets, making it so you could at least walk into town albeit with difficulty, While The best M.C.S could set your max height to six feet tall and with the original asset size at the start of the game.
The weakest M.C.S would have to be extremely expensive, like 50 gold or more maybe, meanwhile the Strongest M.C.S. would be Way more expensive, maybe 200 gold or more?
The M.C.S's would be a mid to late game solution to size, You could also add House upgrades, with a better house accommodating a bigger size and more rooms and storage?
Also you could have new Cauldrons, Bookshelves and Storage chests with different benefits, Like a storage chest that has a chance to spawn a new Plant material each day, or a Chest that can increase the rarity of materials. You could have a Cauldron that has a chance to not use a material when creating a potion, or a cauldron that has a chance to not use mana when you create a potion.
Maybe you meet the Cauldron shop after your first Medium potion and you meet someone leaving a battered store and locking the door as your character passes by, and then after some explanation and lore, Gives you the ability to buy cauldrons from them, using the funds from you buying cauldrons to make their store into a general store that has unique goods for the mid to late game.
Again these are just Idea's you could use, You don't have to use them, You are the developer that is giving us the Gift of your creativity.