u/AccidentPresent6507

I really like my d70 and the way the pictures come out, however when i upload them to my phone and post them on Instagram, the images look super blurry? Does anyone know how to fix this? Maybe Im shooting in the wrong file format? I just want to be able to post the raw photos, I don’t really edit them - just use the d70 to capture my rock climbing adventures. I am a beginner photographer so i’m aware I may be missing something obvious here lol