NB! It seems this console command is not compatible with CS2.
Command Profile

INVNEXTITEM

CS:GO

This command switches to the next item in your inventory. This does not include guns, so will move between items such as your knife and grenades only.

Syntax
invnextitem

Description

This command switches to the next item in your inventory. This does not include guns, so will move between items such as your knife and grenades only.

Syntax And Arguments

invnextitem

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invnext

This command switches to the next item in your inventory. If you have your rifle equipped it will swap to your pistol, and if you have your pistol equipped it will swap you to your knife.

invnextgrenade

This command switches what you have equipped to the next grenade in your inventory. That means if your rifle is drawn you will switch to a grenade, and then using the command again will cycle you through to the next available grenade on you.