Detroit Not Human! I don’t get cyberpunk feeling other than the one building but really cool!
Ok I think you issue, shouldn’t be giving a player look less cartoony instead you can change the environment to make seem more immersive. For example you can try implementing god rays? and also if you haven’t already use the “Future” lighting environment along with some motion blur can just enhance the immersion.
Here is something to go off of.
If you want better animations scrap roblox animations completely and have a look at R15 IK (FABRIK)
This really just makes your game more lively…
This currently has issues so you gonna have to learn or copy bits of the code and make your own
If you are still not satisfied about how the character looks cartoony you could create a custom rig using blender to make a new rig which should be powered by your imagination
Good Luck 