Corrected: I realize that I have many goals and aspirations, but at this moment, my major goal here is to learn to speak 7 languages as soon as possible. (I'm reminded that I still have much to learn). Some of your verb tenses don't match, and I've changed these.

If time is short the last resort could be an attempt to slow down the Earth's orbital motion. Please keep us informed before such an attempt.

I realized that I have many goals and aspirations. At this time, for instance, I want to speak seven languages as soon as possible. This goal is so daunting now that I am trying it, I am realizing that I have much to learn.

I realized that i had many goals and aspirations, but now my major goal here is to be able to speak 7 languages as soon as possible.