Why does my nose tip seem harder, stronger some days , and really soft and weak on others? I feel like it changes the look of it

You do not say whether or not you had recent nose surgery. If so, this would be common for many many months after surgery due to small amounts of swelling that cause this. If you have not had any nasal surgery, I do not know why you would feel this way but doubt it has any real significance. You could see an experienced nose surgeon for an evaluation.

If you have had nasal surgery within the past 6-12 months it would be common for you to experience periods of intermittent tip edema: lymphatics and scar tissue in the nasal tip can take as long as a year to stabilize.