Simply add a hotkey that swaps the currently selected item on the hotbar with the item immediately above it in the inventory. This would effectively double the size of the hotbar.
The downside is it requires you memorize where things are in the inventory. The player could always keep food above the first slot, for example, or the axe and shovel always together or you keep stone stairs and stone blocks above each other for easier building. This would reduce the amount of inventory management needed to move things onto the hotbar.
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