After English and Sicilian - WHAT NEXT?

I like the aggressive openings and study quite a bit of English and Sicilian. May I have your recommendations for another system to take on?? Is there another flank opening I should study or something else?

"I fear not the man who has practiced 10,000 kicks once, but I fear the man who has practiced one kick 10,000 times."

-- Bruce Lee

1.Na3

Perhaps the ultimate flankattack? Have highest winningpercentage according 365Chess.com.

To TheBigDecline,
Thank you - sharpen the existing tools on the shelf

First you need something with Black against 1.d4. Depending on your interpretation of the Sicilian (d6/e6/Nc6/ others ?), you can consider the Nimzo-Indian & Bogo/QID, or the Grunfeld, or the QGA, or the Benoni/Benko/Blumenfeld or even the KID (if you play the Sicilian Dragon). There are some synergies, but not a lot (unlike between the Slav and the Caro-Kann).
With the English, the Sicilian and any of these 5, you have a flexible repertoire and you will learn a lot about chess.

A-Cielbleu, thank you for these.

I definitely agree with @A-Cielbleu that you need something against 1.d4 and I think that Leningrad Dutch (with c6) may be an interesting option.
- it is universal, you can play it against 1.d4, 1.c4 1.Nf3, 1.g3...
- it was played by the best players, including Nakamura and Caruana, numerous times
- it is not symmetrical, which could suit your style
- it has basically one mainline:
1. d4 f5 2. g3 Nf6 3. Bg2 g6 4. Nf3 Bg7
5. O-O O-O 6. c4 d6 7. Nc3 c6

Of course, anything recommended by @A-Cielbleu is a valid option as well.