Ronaldo looks very frustrated with his performance. I see at this time the CR7 seems to be depressed so it is very difficult to restore the actual performance. But I'm sure if Erik Ten Haag gives Ronaldo minutes every week he will find his best form again. Ten Haag must also focus on his squad and not be consumed by issues that make him hesitate in making decisions and the former Ajax manager must also make use of experienced players like Casemiro and Varane.
Yes, he didn't seem to be enjoying his performance in that game, it was clear from his expression when he missed his chance to score. he was very depressed, especially when Omonia had an early lead in the first half. he really wanted to score, but he could only provide one assist to Rashford.
You forget, Ronaldo is always installed as the main starter in every Europa league competition. but in his three appearances, he can only create one goal and even then from a penalty goal.
IMO, he has to start making peace with himself first, leave his ego behind and start enjoying his current position.
I'm sure, if he does, slowly, he will find his rhythm again.
Some seasons, Ronaldo used to have a slow start. I remember even the media will be trolling him and he will be pained. But at a time he will turn around his performance and start scoring goals.
Why he hasn't picked till now is because he has not gotten enough playing time. If Erik gives him some more playing time, he will find his form and happiness again.