I remember fondly of my Canon T2i, it was my last Canon DSLR. The IQ is still competitive in 2019, in fact, you don't notice much advantage moving up to the newer 24mp Canon sensor from 18mp.
If IQ is important to you, then I would switch to Sony / Fuji / Nikon with that uses a Sony made 24mp BSi sensor. Sony Bsi sensor provide a noticeable improvement over Canon 18mp/24mp in Dynamic Range and offer superior high iso3200/6400 performace that plagues the canons sensor.
In either case, I would KEEP the T2i as it doesn't worth much in the used market anyways.