Whoever said that you should spend the time studying while whiling away all those hours in your free hotel room with wi fi provided is right. You could, for instance, approach someone such as Clark Rickett for possible sponsorship with a view to specialising in aviation law. Such a specialised course so early on in a legal plan of action would give direction towards a goal as you studied within your specialised field whilst continuing to earn a reasonable living as a pilot.
If you're 21 now then there's plenty of time to complete an LLB, or whatever, and having kept your airline job and by then, no doubt a captain, you'd be able to transition from one decent paid job to another and then to develop frippery flying as a hobby.