I agree with these two, but I must say, you don't shield enough, you greatly overestimate the range of your moves, you REALLY need to use your projectiles more, and most importantly, you need to learn your techs!
Your playstyle is a little sloppy now, but as you analyze your gameplay more, and get your techs down, you could become a lot better. You knew what that Ness was doing most of the time. I see potential.
P.S. Izaw's guide 'The Art of Link' is VERY helpful.
Responding to your new post:
Your goal is to try as hard as you can to keep the opponent away from you, your projectiles can slaughter just about anyone who can't spam back, I find that a good Z-air is good to space if the opponent gets close to you and is fairly tall, and maybe the first swing of a forward smash is a decent spacer, or just use a U-tilt, or a F-Tilt if they get too close, if they miss with an attack that is fairly long, and isn't too far away from you then a grab works, it really comes down to what's fairly effective, but is still comfortable for you, too, or use just what feels right depending on the situation.
Most importantly, when you reach the plateau, or the point where you feel like your progress slows to a snail's pace, just keep confident, and try to find pros to practice with, or just to get some practice with, it helped me out a lot.
P.S. I know Legan is always down for some matches, you should drop him a pm or visit his thread, it should be a few down from this one. Feel free to Pm me is you want to brawl or if you have any questions too, I'm not pro, but I feel like I have a fairly decent understanding of the game.