Hmmm... alright, lets see... in general. You are a bit too... Hmm... you jump in the fight a bit too much. Try to weave in and out with an attack. What you can do is try to wall someone. Try this technique! You'll see how much you'll improve when you apply this to your game. In order to wall someone you have to use your character's farthers reaching attack and weave in and out. For example, Marth walls someone with thier F-air. It has a lot of range and it's tough to get in and actually hurt Marth. ._. Another one, G&W, he loves to weave in and out with that damn B-air, that turtle! >_< My Kirby wall's and spaces with b-air. I'm sure you may have knowticed it. It can be annoying as I've faced the Kirby ditto! Ness, I've seen players wall and space with thier F-air. It has nice range. Space it, weave in and out of your opponents range. You can get your opponents to become fustrated and do something out of thier confort zone and that is where you can punish! Ness's B-throw anyone?
You'll start to see that you'll need a bit more patience. Once you meet reaaaally good player's, they'll put your skills and patience to the test. Not all characters have a good attack to wall someone with though. And some characters can outrange your attempt to wall. Ex. G&W turtle>Kirby's bair. That is where you'll have to try to bait and outsmart them. Luckily, you have projectiles to spam. Space those as well.
Though, I'm not sure what Lucas has to wall (hmm).
I've faced a killer Lucas in teams a while ago. Maybe it's cause he does really well in teams but Lucas has that Magnet Pull and Boost Jump shenanigans! Combined with B-reversals it's hard to catch and predict that little *mumble mumble*. Try to maybe practice doing some of those and applying it to your Lucas game. Also, don't throw out too much Smash attacks with Lucas. Yeah, they are pretty strong I know but laggy too. Try to think a bit before launching it rather than hoping it will hit. I know you got it in you man, I saw you do some neat stuff.
Whoa, wall-o-text