Big question of "why electrons don't fall into nucleus" is answered here in classical physics.
Instead of Coulomb Potentials, electrons and protons were treated as conventional particles in an atom, exhibiting attraction and repulsion between them, giving a stable atom simulation.
New potentials were developed for protons and electrons to simulate an full atom.
Simulation of Carbon Atom for 5000 Time Steps
Uranium Atom Simulation
Stable Uranium Atom Simulation with Protons, Neutrons and Electrons in it
New Potentials were Developed for Protons, Electrons and Neutrons to Simulate a Stable Atom, as shown in the video
Monte Carlo Simulations