I'm gunna go really in depth with game 2.
at :12, the spacie will almost always side b. Step back and be patient, you went for the stomp and he just side b'd over you instead of into you.
you dd camp well, but at :16 you had your opening for a grab and you didn't take it. then he spot dodged and you again did not punish it.
:20 same as before, but you actually did an empty fsmash which would lead into nothing even if it did hit
at :21 you miss the uthrow DI. no biggie. but then you survival DI'd expecting a usmash, which you should not have done due to your %. You should DI behind him after a utilt.
after the knee at :30 and his missed tech, you should have moved up to be ready to tech chase. I would have approached him, then if he didn't move by the time i got there i would have shielded and shield grabbed a get up attack, and if he didn't do that (don't sit in shield for long at all) I would have short hopped, or WD back, or dd away then back again expecting him to roll after seeing my show my shield.
at like :33 when you usmashed, just go into a knee. I know it's tempting to go for the epic combos, but just knee into ledge guard. I'm too lazy to go in depth with the rest, so..
NEVER go into that part of the stage against fox, EVER. no matter how safe you think it is. you'll lose your stock if you get hit even one time because it will combo into an infinite.
you tried to tech chase into a nair when he's at 133%, and your edge guarding needs work. bad idea. even if the nair hit you might have missed your ledge guard
you really shouldn't nair approach so much when he's at a high percent. try a shield approach when he's dd / laser camping you like that, he'll probably shield as you run up and you can just shield grab before he does
you daired him at a really high %, knowing you couldn't follow it up and knowing he probably wouldn't die from it. a bair would have been quicker, would have killed him, and would have been less risky if it missed.
and quit following nairs with jabs at low percents, follow it with a grab
a lot of times he would full hop dair into you or just in general approach you from above. just dash dance back and punish whatever he lands with.
at 3:33, almost every single player will always tech/roll towards a wall when they're getting combo'd, out of pure habit. i promise you if you aim your tech chase for that it will almost always pay off (very intelligent/good players will not do this, but almost all will)
in general, better ledge guarding, better tech chasing, better decision making
you are pretty smart with your dd's. continue to use them like you do, and also use them when being full hop/dj approached from above