How would this make Snake any funner for him? Might as well tell him to only try to use F-smash and see if he can win. Not saying Snake can't do without those moves, but, taking moves out of Snake's moveset won't make him funner to use, simply more frustrating.
Snake overall just rocks, what you can do with explosives and set control on the stage is just amazing. And Snake can punish mistakes like no other. I understand you have been using Snake for a long time and he can get boring, maybe a good antidote can be to save Snake for your hard matchups, and in the more common friendlies and such use your next best alt.
Find who your favorite character is and use him, and save your best for when you need him. That's why I main R.O.B. even though he isn't my best (which of course, is Meta Knight, but all obviousness aside, I pull out G&W as my trump card).
No one can tell you what to do because everyone is unique, but I hope you find that one thing that can spark an idea that will make Snake interesting for you again.
Best of luck!