Upgradable Inventory

As more and more items are added to minecraft things are starting to get cluttered. We need a way to upgrade our inventory. While shulkers and bundles are nice they are not the solution. I think we should be able to upgrade our inventory to be able to tell it not to pick up certain items or to auto fill shulkers and bundles with items of our choosing. This would help keep clutter down. This would still not fix it as there are so many useful items and it would be nice to have the ability to up the amount of inventory and hotbar slots we have as well. As for how this is done, it could be that we have to craft upgrades using increasingly rare materials such as iron - netherite, ender pearls, and maybe a final upgrade with a nether star. This would give more reasons to kill the wither besides making a beacon