My gameplan at this point is basically just to clear my head and avoid any thoughts of a gameplan. Whenever I try to come up with a strategy, my game just devolves into repeatedly trying to force one option instead of just reacting and punishing.
It's a serious problem during tournaments. My last match was pretty much just me spamming DACUS like a mad man.
If you don't mind, I would like to share my own opinions about game plans, as I think this conversation is important. Your game plan should not be related to a certain move, but rather, a certain style of play. Your game plan should allow you to dictate the pace of the match through your actions, ultimately making you as comfortable as possible.
Say I'm a really fast, aggressive Ganon. I like to waveland a lot, and I go deep offstage sometimes because I want to end stocks as early as possible My game plan should be:
I'm going to assert my dominance from the get go. I'm going to apply pressure and try my hardest to get my opponent off balance, because that's how I get kills. However, I won't overcommit myself, since that gets me punished. I'm going to space well, trap my opponent and force him to act the way I want to
Now lets say I'm a slower, methodical Ganon. I rely on baits, and I try to punish my opponent for overcommitting as often as possible. my game plan should be:
I'm going to feel out my opponent for the first minute. I'll throw out an Arty Vortex or a well-spaced fair to see how he reacts, and then next time I'll capitalize. I will study their movements and try to find the points when they leave themselves vulnerable. Then, I will act in a way that encourages them to act predictably.
Both of these mindsets are true game plans. They have little or nothing to do with moves or tech skill. The strength in these game plans is they allow you, the player, to be as comfortable as possible. Providing a loose flowchart for how you will act during the match is incredibly powerful, as it can both get you started in the right direction and bring you back to normalcy when you find yourself off-balance.
Although this kind of game plan can help you work around your own physical limitations, it is most effective when you have complete mastery over your character. When you have access to all the options, you can devise a game plan that is both specific and general at the same time. If you're aggressive, having every possible approaching tool at your disposal will allow you to adapt to how your opponent defends. If you're passive, being able to bait in each and every known way will help you tailor a setup that exposes your opponent's flaws.
While this may sound daunting at first, Smash is not nearly complicated enough that you'll never be able to analyze every situation. Comfort with your own character, coupled with a little experience with the type of opponent you are facing, can help you devise a simple, effective strategy that fits inside your game plan as soon as you notice your opponent's habits. There are no ridiculous mind games or intense analytics involved, rather, basic observational skills and a little experience.
Just my thoughts.