Hi, jessicita.hi sorry for the late reply
as i already paid 1500 CAD i want to make use of it~
and in case something goes wrong with my EE application this 600 points would be a back up
btw i really got such letter yesterday asking me to reject my ITA
they said my EE profile is no longer visible
plus i have to fix my employment letter
and my status went to awaiting information.
now my concern became that if i reject ITA and not get OINP nomination either, what should i do!?
Yes, 1,500 dollars is a lot of money, but I wouldn't think as it was wasted. I'd rather see it as something I've paid not wanting to make use, like a car insurance, for instance. I don't think anyone intentionally damages his/her own car just to make use of the money spent on insurance, right? Moreover, if you accept Ontario's nomination, you'll be bounded to live in Ontario (at least, for some time), while with the direct ITA you can live anywhere in Canada.
I'm not sure about what you meant with "in case something goes wrong with my EE application," because you'll face the same requirements to receive the permanent residency, whether or not you're a nominee. Once you apply, it makes no difference if your CRS is 415 or 1,015.
Finally, you've already realized that you'd be taking some sort of risk by rejecting the ITA you already have just to receive the nomination that, all in all, will give you nothing but another ITA.
So, if I was in your situation, I'd forget about OINP and move on with the direct ITA, gathering all required documents and asking a professional to review them before sending to CIC. Anyway, this is only my opinion. Wish you the best.