Vaz,
Congrats on getting your license. No small accomplishment from the sound of it.
You didn't mention if you're currently flying any particular airplane on a regular basis. Genghis is certainly right about knowing the airplane you fly. But if you're not flying a particular airplane at the moment, spending some time on generic aircraft systems might be interesting for you, e.g., how hydraulic/electrical/flight instrument systems work. You could pick a particular aircraft type you might be flying in the future and read up on whatever info the internet has on its systems. Also, a generic FMS system tutorial where you can load flight plans and see how they look and can be manipulated would be good.
Current airline manuals may be "dumbed down" a bit from those of the past and may not offer great depth of systems' knowledge. But studying generic systems might be enlightening at your stage.
If you're a glutton for punishment, you can Google a free copy of
Aerodynamics for Naval Aviators and see what you make of that. And
Handling the Big Jets is a must.
Good luck. Once you start the studying, there's really no place to stop...until retirement.
