ATPL will be much much much harder.
Nothing stoping you from become a pilot. But you should prepare to put down a lot of work in it.
As well, try to find a good instructor, that may help you a lot.
My final advise, use online question banks. BUT don't use them to memorise question, but rather to test your self.
Memorising question may work for PPL, IR and even com., but not for ATPL.
good luck mate!