disclaimer: i don't promise that this is good advice. i sorta just watched the matches and began talking out my *** with general impressions/assumptions
hopefully it helps
vs fox:
i think you were being a little too passive and predictable with your anti-approaches.
you probably could've benefited from more movement (dashdancing with shields and wavedashes) or aggression since there was a bunch of space between you two, and he was playing sorta patiently, but you were sorta cornered and got punished for swinging your sword a lot. like, instead of waiting for him to come to you, you could've made him run away from you, closed the space, baited him a little more closely, or something along those lines.
you could've had some more aggressive pressure (like, do sorta what you were doing, except when you're closer to him. move around, get closer, and use well-spaced aerials mixed with d-tilts, jabs, forward B's. if he runs into them, great. if he runs away, react or adapt). that sounds wrong. you could have been more aggressive so he couldn't walk all over you, but not aggressive in the sense that you're committing to approaches. like i said, you probably could've benefited from more movement and placing your sword a little better (sorry, i can't explain that)
you seemed to have gotten caught a lot when you jumped in the air. you might have been able to either stop going in the air or began mixing it up when you were in the air (maybe you could've done something to counter how he was punishing you... like, if he would catch you early in your jump, you could throw something out. if he was waiting to get under your fair/nair, you could have daired. alternatively, you could have began using empty shorthops and wavelands to bait)
against patient space animals, it sorta seems like you have to absolutely master baiting (hurr durr) and be able to call when they're not going to act. like, it's not always a matter of making them approach, but you also have to pick the right anti-approach to stuff them :/ like, if they approach with a crouch cancel, you have to grab or dair (or WD back. the standard jabs and fairs don't really work *too* well, unfortunately). if they approach in the air, there's a bunch of other mixups that go into that.
i'm still working on solidifying my game vs patient falcos and foxes, myself, so i'll get back to you on that
edit: something that i'm trying to do more is ledgehop -> counter. marth's ledgehop aerials (and even waveland utilt) gets beat a LOTTTTT by fullhop aerials, even if you KNOW it's coming. axe told me to just ledgehop counter in this situation, since marth doesn't have an invincible ledge waveland like all the other good characters.
also, i don't think u-tilt is that great for punishing fullhop/high aerial approaches. it's something i used to do a lot too, but it's just too easy to avoid. you could possibly try to master the mindgames and timing, but i think it's safer to do fairs/uairs against them. like, if unknown did a fullhop dair, you'd u-tilt. i don't think that works very well. alternately, you could counter or dash out of the way, but dashdancing away would probably take more effort to follow up, since that introduces a few other mixups (because even if you avoid the dair, you still have to get the grab), plus he might be able to punish that since the timing on falco's FH dair is sorta awkward. you might be able to back away and fsmash/ftilt/aerial where he lands. i'm not sure. i'm pretty sure there's SOMETHING easy he could do to follow up on you moving out of his way, but it's hard for me to visualize the situations in my head right now.