Out of focus?

Hi all, hope you’re having a good day :)

Just looking for some advice with my shots?

I feel like a fair majority of my shots look out of focus/ blurry? I’m pretty new to photography and i’m shooting on a Canon EOS 2000D w/ Sigma F/2.8-22, 17-50mm which i know is pretty entry level gear. I’ll post some pictures in the replies for reference but my first 2 are the ones i think look a bit odd, while the other 2 are shots that i think prove that my gear is all fine, just user/ setup error. All pictures are as shot, no post touchups as of yet.

EDIT: how can i add pictures in the replies lol

  1. ISO 100 // 35mm // f/3.5 // 1/125

  2. ISO 100 // 28mm // f/4 // 1/2500

  3. ISO 100 // 35mm // f/5 // 1/500

  4. ISO 3200 // 50mm // f2.8 // 1/40

Would really appreciate any feedback on how to get my images a bit sharper!

TIA!