You won't like my answer and neither will those who are looking for an easy rout or solution. The issue of upgrading cuts across all cameras and camera types; not just DSLRs. The first question you must ask yourself is a simple one, but very hard to answer honestly. Are you trying to fit yourself into the upgrade or are you trying to fit the upgrade to you? Most, believe it or not, try to fit themselves into the upgrade. You can see this all the time. A new model comes out and everyone rushes to buy it. They are trying to fit themselves to the upgrade without even a thought of how well it suits them. Going FF at this time is just jumping on the bandwagon. If you really had a need for it you would have gone there long ago, at the very beginning. Because it means a whole different lens mount than a cropped sensor camera. And, I would take it a step further. I would bet your 'need' to upgrade is nothing more than a 'need' to join the crowd. Instead, I would bet you are quite happy with your D3300, and as strange as it may seem, that probably bothers you. But, be honest about it. Happiness is what we all seek. Really, truly. And, if you are happy then give yourself credit rather than daming yourself for it. Because you got something that most others go looking for and spend all of their time looking for; while never truly finding it. So, seems to me, you need to spend some serious time with yourself and do some serious soul searching. The reason I know this is because a D7500 and any old FF are miles apart. That's not even a realistic and narrowed field to work with. You haven't even begun to deal with it, yet. Good luck.