Valve, Blizzard, and Activision cannot stop cheating even with $ billions worth of resources and armies of programmers. You have no chance. I’d worry about your game getting popular enough that anyone would want to cheat first. 
Making all player actions 100% server-side makes it only “somewhat” cheat-proof. Data required for rendering still allows aimbots and wallhacks.
Even if you went so far as: (1) client only sends inputs, (2) server renders what the client sees and only sends an image (basically Google Stadia) image-based cheats are still possible and so is automation …