I am not an audio pro and can't give you tricks to improve sounds, I will just give you my feeling.
I think that in your case, your intonation is the main cause.
You should try to be more dynamic, and to be in harmony with what you say excepted if you are supposed to be a bot without any feeling. You seem to just read the words without caring about the sense, it is not stimulating at all. For an example, for "I'm ready when you are", you should say it much more dynamicly if it is for a soldier, or for fight orders or anything relative to intensive action, as if the soldier only waits to fight and is ready and nervous, or could be the sleepy version of the human worker in Warcraft 3, just find yours according to your use, but don't just say words.
You are totally neutral in your intonations, so excepted the words, you don't send any message. Hear SC2 voices, each of them has a soul, a strong and theatrical personality.
You can listen to game voices to get ideas for intonations, for which message you want to send.
An other issue that I noticed is a low quality or something : your sounds are strange, seems there is 2 channels, one louder than the other, maybe with your pitch you have modified only one channel, no idea, but the result is not great in my opinion.