I need some guidance, should I buy a new camera?

Context: I got an old T5 (1200D) that my dad bought years and years ago. I have the kit lens and two months ago I got a used Canon 50mm 1.4 USM. I'm really enjoying it, I know this is not the best 50mm but compared to the kit lens it's just miles ahead. The thing I think is kinda demotivating me right now is the autofocus, I miss A LOT of shots, is this normal? They look sharp when I see on the camera display but on the PC they look really soft and out of focus. I won't lie, I can get some pretty nice shots but they are not as sharp as I would like.

What's a reasonable upgrade that would give me a better autofocus? I'm eyeing the R50 but maybe that's too much for me. Any other recommendations in the DSLR arena that are cheaper than the R50? The T7+ isn't much better, is it? Needless to say, I'm not a professional and do not intend to be one. Edit: one of my ideas is too buy the 24mm EF-S, too. But I really think I could have a much better camera body for not a lot of money. Edit 2: I'm in Brazil, so really limited options compared to the US or Europe.

(1) Budget, country, and currency: 500 USD, Brazil, Real

(2) What equipment, if any, you have now and why is it no longer meeting your needs? Canon 1200D

(3) What kinds of subjects do you intend to shoot? Portraits, landscape

(4) Is it primarily for photography, videography, or both? Photography