edit - mixa, please name everything I could improve on. I don't know much at all.
I watched your match vs Stranded (Falcon).
Dream Land camping
Camping is good, but you're doing it from center-ish stage, if Falcon is hanging around the top platform, you'll get Bair'd/Dair'd → Grab.
Unlike in Melee, in 64 when you hold down while in the air, you don't go through platforms (unless after Up-B), you land instead. This makes camping below the side plats really efficient. Most japanese Kirbys do that, here's
Sin vs kysk, in which camping is all Kirby did (he lost though).
Movement
Consider pivoting and dash dancing. I'm not sure for long standing still will work.
Kirby's slanted/running c-jump aligns with the side platforms of DL and the ones in Hyrule. This makes Kirby faster and less vulnerable when moving.
Here's a combo that uses this. His Bair bairly connected and he could already Fsmash. That's what you have to do in a tech-chase situation.
Here you threw a Nair that lead to nothing. Had you not gone beyond the platform, you could L-cancel and punish the hitstun with grab or Utilt.
Stuff
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Be careful when hitting the shield that is near the edge, you'll push him off and he'll punish you. Stranded didn't, but he could've.
It's the same situation when a Falcon upsmashes a shield like this:
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^ what followed was Falcon got Fair'd → Upsmash and died.
Ah, you could also improve a bit on the comboing. It looks like you know what moves to do, I guess you just need to practice more.
But all in all you take very good decisions, great to watch.