Its always good to have a backup plan, but before that, you should start spending your money wisely... meaning "save" for the difficult times...
I do not have a particular idea in mind, but why don't you think of doing an investment back home in Yemen.
Small investments, not a big ones, like starting a pharmacy and putting someone on it, or a shop, or anything that can help you grow business in your own country.
The US has a potential for a lot of ideas, but it also have a huge risk, because thousands of businesses fail in their first year in the US.. so you should be patient when planning a business in the US... and you should have a good "cause" for starting this business... just to keep you going and determined to make it a success.
One idea that you might explore is importing goods from Yemen, especially if you live in an area full of Yemenis, this is a new trend in business. Recent studies showed that most of the immigrant will buy and spend more on goods from back home, they tend to like the idea and support it. So, if you are in a large Yemeni community, you may start thinking of providing them with goods from Yemen, not necesserly the unique stuff that do not exist in the US, but also stuff that have been made in Yemen and have similar products here, for example:
- Milk
- Tomato Sauce
- Yogurt
- Sweets
- Cookies
- Clothes
I know what you are thinking now ! you may ask "Why the hell would i import Yemeni or arabic tomato sauce while the US produce much better quality than ours?? right???
That's the twist, people -naturally- love what they grew up with... mostly. So, if you bring them goods from backhome, they would want to stay attached by buying these stuff.
that's just an idea
Good luck, and try to kiss up more with your boss, so you don't get layed off. :P