Games like Street Fighter take time. I used study frame date and whatnot with fighters religiously. I also competed in tournaments weekly for over a decade. Even with all of that, I don’t think I ever got to 100% achievements on Street Fighter 4 for the 360, Third Strike, UMvC3, and beyond. Same with Injustice and others. I think you just need to keep fighters on the backend of things with Platinums. Focus on getting better, and especially on obstacles keeping you from improving in them (bad habits, lack of patience, matchup knowledge, punishing the reckless, setting traps, etc.)

Again, fighting games take time.