My Solution For The Inventory Problem

Before we start, every single item that isn't tools, armours and weapons should be able to be stack to 64. Now that that's out of the way, here's my idea

The inventory slots we have currently, will be called, The Prime Inventory. No picked up item will be going into the Prime Inventory.

Tabs option will appear beside/above the Prime Inventory. These Tabs consist of Blocks, Consumables, Miscellaneous and whatever category Mojang decides to add. Perhaps there's 5 or 7 maximum Tabs. These Tabs interface will Appear Beside The Prime Inventory. Appears similar to that of the crafting tab that appears beside the inventory in current Minecraft when using the Recipe Book. This will enable player to sort item between the Prime Inventory and whichever Tab the player desires to open.

Third, there will be a Tab that the player can switch to that shows all the picked up items during your gameplay. I will refer to this as Neutral Tab

Sorting options such as Amount, Dimensions, and other options Mojang decides to add will appear in every tab except for Prime Inventory

Items will be able to be multiselect to drop it from the player's inventory through the delete icon. Flint and Steel, Lava Bucket and Cactus can be place at the delete icon in the inventory. Say the player puts a Cacti Block at the delete icon slot. Once items  are multiselected and the player presses the delete button, it will now delete the item(s) permanently since a Cacti Block is now occupying the delete icon slot.