I just have time to look at the fox match right now. I'll come back and do the other 2 later.
I agree with Soju that your neutral game is currently the weak point of your game. You're movement is fairly good, you had some good edgeguards, and you have quite a bit of advanced tech fairly well down. Here are things I noticed watching the video.
Fox: At the very beginning of the first game, you seem to be throwing out u-smash and d-smash a lot hoping that the fox will be too aggressive and run/jump into it. Out of the 5 times you do this only the last one actually connects. You didn't get punished too hard for your misses, but you could have been. If you're trying to prevent a fox approach, forward-tilt and down-tilt are safer options. The u-smash at 1:40 for example were a tilt would have been better.
The edge guard at 2:45 was sick.
Work on chain grabs or at least u-throw into u-smash on spacies.
At the start of the match your only approach in jump in nair. Around 3:00 you start mixing up it more (start using d-tilt) and it has good results for you.
You DI'd most of the u-throw -> u-airs very well. Are you also going for smash DI on these?
F-smash for the edge guard is not always the best option. The last edgeguard of the first game worked out for you, but had the fox sweet-spotted or teched it he could have gotten up and punished you. I think the fox was at low enough % that Downwards f-tilt-> run-off nair -> uair spike would have work, and been safer since the hitbox reaches below the ledge and might not have hit hard enough for him to be able to tech.
Game 2 I like that you tried approaching with grab more. The more approach options you have to mix up the better.
Good jolt sniping at 4:40!
What were you trying to go for with the side-b's?
The thunderjolt approach was very good. The fox was giving you quite a bit of space this match, so I think you could have used this type of approach more to mix things up.
Mix-up your recovery angles more. I see you going low and close to the stage a lot and then up-b'ing up above the ledge and then either straight back down to grab it or into the stage. Around 6:25 I think staying away from the stage a little and then sweet spotting by coming up and then using a slight downwards angle would have let you take edge. When Axe is recovering high like that you see him throw out 1-2 thunderjolts to force the person off the edge to give you better options to recover. This would have been the perfect place to do that.
Game 3 I feel bad for that fox. You had good edgeguards. Also that fox needs to work on his angles.
My last comment is about shield dropping, I think everyone needs to practice their shield drops, but you're doing them more consistently then a lot of people I know. The only thing is from these matches I saw you almost always go for the shield drop when you're on a platform near fox. Mix it up more. Every platform is its own mini-game to get down. You have quite a few options (shield drop, dash -> shield drop, run off, quick attack to the edge, jump to higher platform, shorthop to other platform, u-smash oos, etc.), so use them.
Hope this helps!
-Mittenz