Ok serious response now. I started with an 1100d (think that is a T3 in US parlance). I then got a 650d a year later, then after that a 70d when it came out. Then I ditched Canon and went Sony A7 and through a lot of planet alignment luck, a Leica. In amongst this I have been using L series glass on the Canons and a vast selection of gorgeous legacy, Zeiss and of late, Leica glass.
What have I learned? Well, I have learned two things,
1. It is all about the emotional connection to taking the picture so get a camera that you will use and will make you WANT to use IT. I have that in the M9
2. I still suck at photography despite "upgrading". Now you need to learn this for yourself as no amount of people saying it will make you believe it but you really have all you need right now to take great pictures.
I think MAYBE an upgrade to a 750/760d would be OK as it takes you out of entry level into mid range with some useful stuff but seriously, you wont realise the true benefit unless you work on taking great pictures with the kit you have right now.
I am currently rocking a Leica M9 and a Sony A7Rii. Top end gear so I now know the weakest link is me not my gear. I am now happier as I try to focus on me getting better rather than the next trinket to buy. Don't get me wrong, I am known on here for my GAS but I am much better than I was.
My point is, start a saving pot now, tell yourself that when you wear out the T3 or you find something IT cannot do then upgrade at that point. Dont get caught up in camera envy as that costs a fortune!
You will get more joy from becoming an expert in your gear you have than constantly being in the " new gear, dont know how to fully use it" category.
Hope this helps.
K