The upcoming speech

I'm so excited, because I will have a speech in class. Once I had a speech, which I prepared for for a long time. But to my disappointment is that i  I was too nervous to reach my expectations. So, now I have to write a powerful speech to make up for the last of failure. come on ！

Good luck with your upcoming speech! 

The upcoming speech

The Upcoming Speech

My Upcoming Speech (slightly better)

I'm so excited,because I will have a speech in class.

I'm so excited[  ] because I will have a speech in class.

( [   ]  = I took something out)

See also:

I'm so excited because I will give a speech in class.  ("give a speech" slightly better than "have a speech").

I'm so excited because I will be giving a speech in class (tomorrow, next week, later today, etc.)

I'm so excited because I will have to give a speech in class (tomorrow, next week, later today, etc.).

once i had a speech, i was prepared a long time.

Once I had to give a speech and I was prepared for a long time.

Once I had a speech to give, and I was prepared for a long time.

... and I had been prepared for a long time.

... and I had prepared for a long time.

One time . . .

but to my disappoint is that i too nervous to reach my expect.

But to my disappointment, I was too nervous to reach my expectations.

... I was so nervous that I didn't reach my expectations.

(to) disappoint = verb

disappointment = noun

(to) expect = verb

expectation(s) = nouns

so ,now i have to write a powerful speech to make up for last of failure. come on ！

So now I have to write a powerful speech to make up for my last [  ] failure.