Okay so you are serious. I’m not sure if you are familiar with tabletop rules or not.
Firebolt is 1D10 to align with the damage output of all the other classes. It’s an unlimited resource like say a sword or arrow (in this game). If you buff it and add DoT with surface effects, you are reducing the value of all the other classes. Firebolt also scales well as you level.
You should be able to have a familiar and animal companion. That’s a known issue that’s been stated. Animal abilities are fine as is. If they can’t keep up with your character, a change in tactics is in order.
Fighter is not a melee oriented class. They are actually the best archers. They are the best with weapons. Second Wind scales with levels albeit slower than what you suggest.
Rogues can hide again if they move away from line of sight.
Cure Wounds require touch because it heals more than Healing Word. That’s the whole point. There has to be some disadvantage otherwise why even have Healing Word?
I am not suggesting there is a ground effect for firebolt. I am suggesting that its initial impact damage is slightly increased (10-20%) and Potentially looking at causing it to apply a damage over time effect (if testing shows the initial damage buff is insufficient)
Not being able to change from bear to wolf in combat is a serious design flaw for ranger, and significantly diminishes the potential of the class, and its fun factor. I cannot express how much more better the class would be if these abilities could be used in battle.
A common tactic in rogues is to get invisibility, hex a target, and then guidance buff the rogue/thief and pickpocket for optimal chances. Having invisibility, or a cloud to shroud them protects from the sight of others walking around which can potentially cause the class to get cough while stealing. Giving the rogue the fog so they can avoid line of sight of others is a way to enhance the class to not depend on another to provide a functional benefit to its party. this is especially true in multiplayer (where a wizard might not be in party), but can apply to a single player mode where a player simply does not want to run a wizard.
As for cure wounds I could meet you half way in the middle and say buff its range 6m?