That is a good build for a front line melee.
Consider a keen enhancement on the greatsword or look to take Improved Critical as your next feat to take advantage of the roll twice feature of your order. 17-20 crit range on a greatsword can do wonders, but it is really deadly with two chances to roll in that range.
Consider a scarlet and blue sphere ioun stone that gives +2 int and doesn't take up a slot to pick up another skill at max ranks eventually. As you get higher level, ability modifiers matter (slightly) less with skills since most of the bonus will come from ranks in the skill. Do this soon if the party has a particular skill that no one is decent with.
Also for magic items, boots of haste will get you another attack when you really need it, but also +30' of movement which will help you get to vulnerable enemies that tend to hide in the back of their party.
Planning several levels out, the feats Following Step and Step Up and Strike are some of my favorites since they allow you to position yourself for a flank without costing you any actions. Add an armor spike to your armor with the Menacing magic ability and both of your flanks bonuses go up to +4.
Lastly, the search function on the Archives of Nethys can be really fun if you are looking for ways to increase your class abilities and have some extra time. Typing in "challenge" will get you some cool magic items. (particularly Champion's Banner!) Archives of Nethys.