I'm in the second year with my X-T2 and when I saw the reviews of the X-T3 I saw a few things that peaked my interest too. But after considering my shooting needs , I did not think the upgrade would make me a better photographer.
Like you, I don't do video. But the advantage over the X-T1 could be significant depending on your photographic needs (not wants) . The16 mpx of the X-T1 really is enough for great prints of 16 x 20 +. Coming from Pentax, all X series cameras focus much faster and more accurate . I also rarely use the boost mode, only needed for fast action.
If you shoot a lot of low light photography, you, and I, could benefit from the improved sensors lower noise at higher ISO, but low noise is relative ( see the attached image I took, as a guest, at a wedding . ISO 12,800 with the 18-55 f2.8-4).
As long as you are satisfied with your results stop chasing gear. The next camera will always be better than the last...………. I am waiting for the new camera with auto composition. That could help.
Keep shooting