Tricky question that requires an answer from YOU not us. Take a good look in the mirror and be totally honest with yourself. Is your current salary and conditions enough to keep you happy until retirement? Do you go to work with a smile or a frown? How much effort will the studying take? What exactly do you hope to gain by being a captain? Will you resent being a P2 forever? What do you want from life?
Just before I left the military a lot of people were doing licences. Most left because they had endured enough and got jobs. A couple stayed in the mob and when I asked 'why did you waste all that time and money on licences?' they told me 'because everyone else was doing it'!!!!
There are many very happy career P2s in the aviation world, it suits THEM. Choose for yourself, not what others suggest you do