I would look into full frame for sure. I started on the T3i years ago as well and worked my way up through canon's line until i could no longer fight the tech with Sony and now have a couple sony bodies and GM lenses.
On your budget, I would definitely not make the change (unless you take photos for money and have a business to eventually write purchases off onto) until you aare ready to dive in.
Last, I truly am a believer that great glass trumps all, so something to consider as well.
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'21 /// M5 Comp - Frozen Brilliant White/Black
'18 Porsche GT3 Carrara White/Black/Red - Sold
'18 /// M3 - Individual Imola/Black - Sold
'15 /// M4 - YMB/SO - Sold
'12 E92 ///M3 ZCP - AW/FR - Sold
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