Need to work on being faster and keeping your spacing.
You do shdf too much. It's not that good of an approach, it's better for in combo's or interrupting your opponents in their jump. Single late shffl fairs and nairs are better for approaches in shffls. It doesn't look like you fastfall that well although that could just be the crappy quality. Try to play smart rather than flashy around 3 minutes in on the samus v marth one. I don't know why you did all those wavedashes and dashes 40 feet away from a opponent with a projectile. Try to bait a little more with dash dance shffls and grabs more. And try incorporating dash canceled dtilts into your game as a ground approach.
Your falco matchup was slow as well. Just more practice I suppose. Spotdodging is always a bad idea against falco for the most part since wiat lasers do is pin you in place so they can place a well aimed shffl to shine on you. If you spot dodge your still going to be in the same spot and get drill shined.
Waveshielding, dashing to shield, jumping over, and rolling are all better than spotdodging in the falco matchup.
