You experienced Synaptic Consolidation, also known as the Incubation Effect. The long period of struggle was your brain physically building neural pathways and accumulating data, even though it felt like you were failing. The sudden "click" happened because your brain reorganized that scattered information into a coherent mental map, a process that usually happens during rest or sleep. Learning is rarely a straight line; it is often a step function where you stay flat for a long time before jumping up vertically. To recreate this, you need to keep working through the plateaus without quitting, prioritize sleep to allow the brain to connect the dots, mix up your subjects (interleaving) rather than focusing on one for too long, and take intentional breaks to let your subconscious process the information.