I'm required to do the same amount of projects with the same high quality same asas the other managers.

I have no complaints about this pointaspect of the job and would rather feel excited to be in charge of big projects.

It was announced that two people are leaveing thise group next month so that we will have to manage all of the projects with four members.

I haved assumed that some of the other senior staffs will members would take over the important projects that no one has everelse has had experienced with.

Now, I have no choice but to devote all my energy to that.

I work with the head manager and four other managers.

I'm required to do the same amount of projects with the same high quality same as managers.

Is this what you meant to say? I'm a little unclear, so please correct me if I got the meaning wrong

I have no complaints about this pointexpectation and would feel rather feel excited to be in charge of big projects.

"Rather," depending on where it is placed, can change the meaning of a sentence. "I would rather feel excited" means you want to feel excited instead of some other feeling. "I feel rather excited" means you feel extremely excited.

It was announced that two people will leave (or "are leaving") this group next month, so that we will have to manage all projects with (just) four members.

When someone is doing an action currently or in the near future, you should use the present progressive, rather than the simple present. The simple present is used for habitual actions and to describe facts about oneself, so for example, "I eat breakfast every day" vs. "I'm eating breakfast right now."

I have assumed that some of the senior staffs will take over the important projects that no one has ever experiencedothers (in our company) are not experienced enough to do.

"Staff" in this context is a non-count noun, so it cannot take a plural. I'm not sure if my correction matches what you were trying to say, so please let me know if you meant to say something else.

Now, I have no choice but to devote all my energy.

This sentence sounds a bit incomplete, because you devote your energy to *something*. Maybe you can say "Now, I have no choice but to devote all my energy to improving my skills" for example.

I work with the head manager and four other managers.

I'm required to do the same amount of projects withat a high quality same asstandard, as the managers.

I have no complaint about this point and would ratherand instead feel excited to be in charge of big projects.

It was announced that two people will be leaveing this group next month so that we will have to manage all projects with four members.

I have assumed that some of the senior staffs will take over the important projects that no one has ever experienced with.