Should I exercise option, roll or sell it?

So I have just started option trading and got a good open trade betting on Lockheed Martin.

I can't make my mind on what is the best to do here. If I sell the option now before expiry (6sept) I should get the tot amount:
= 799.61

OR

I do exercise the option now at strike price 570, then I should be getting 100*(576.33-570)
= 633.00

OR

Should I roll into a further maturity and strike price, since I believe it could still go higher?

Am I doing some calculation wrong or not understanding smth?