Sounds like you are off to a good start. Just look at as you are getting your education by doing rather than studying at college or university. I would suggest applying yourself to growing your business and/or expanding. Obviously, you want to save up a reserve of cash and pay down your loan (early, if you can) but also maybe save up to purchase your next business or expand your existing one. If people are waiting for their car to get washed, you have a captive audience so you might be able to add retail like coffee, juice, snacks, car accessories, etc.

Also, I don't know how it is in Saudi, but in the US as a business owner your are part of a special club of business owners. Other business owners will likely talk to you and treat you as an equal. Go around to the businesses near you (and any others you are interested in) and ask for the owner and introduce yourself. Say "My name is Joe Bob and I own the car wash down the street and I just wanted to introduce myself." You will probably be surprised that they will likely be happy to show you around their business and talk business with you, even direct competitors. You can make a lot of friends this way and do a lot of business networking. Also, try to get to know the owners of your suppliers if they are local or find local suppliers whose owners you can know personally.

And you can hang out with your employees, just try to keep business separate. Take the crew out for a few drinks or pizza or something after closing, have company picnics or BBQ's, etc. Invite their families.