How the eff do I restart this game? Like fresh start never been played!

trippamy​  Delete the Sims 4 folder in Documents > Electronic Arts.  This holds all your user data: saves, saved households and builds, mods and custom content, etc.  It does NOT contain the game's program files (base game, expansion/game/stuff packs, kits) unless you've installed the game there, in which case you should remove this folder anyway and install somewhere else.