What do I need to improve my warrior deck?

well take out the random cards for starters. if you're going to have royal decree, don't have other traps, because then you can't even use your own traps. just have Royal Decree x3. you can probably take out different dimension capsule to replace for a Smashing Ground and take out Swift Gaia the Fierce Knight, since you'll probably have more than one monster in your hand at a time