you're on the ground too much, you shield way too much and you shield immediately after landing, which will get you grabbed, and well tbh it seems like you don't have tech skill down very well, and DK has little. you miss some L-cancels and wavelands and you don't dash dance much.
your edgeguarding is pretty weak, no offense; you should be dropdown-up-B'ing or B-airing instead of just missing completely with other attacks.
f-tilting is an okay move but you use it a lot and it's punishable and becomes predictable. you should be relying on spaced b-air's and cargo-upthrow -> u-air combos for damage instead of random tilts.
your opponent seems pretty average/bad (and was using a bad char LOL) so you did okay but you won't be able to keep up with most players at all. i suggest watching MEXICAN videos because he's basically the best DK around at the moment. you should analyze his decisions and ask yourself why he does what he does and then use it yourself.
also no johns
