How to renew a US visa for a Dubai expat?

I'm an Egyptian working in Dubai, UAE as an expat. I had a B1/B2 Us visa that expired 2 weeks ago. I travelled twice before to the US to attend technical conferences.
My US visa was originally issue 5 years ago in Cairo, Egypt.

Where should I apply for renewing the visa? Egypt or UAE?
I have no plans to travel to the US in the near future. Can I still renew the visa? or do I have to have a valid travel reason to renew it?
Is it a problem if I don't renew the visa right now and wait for a couple of years in the future for example?

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How can I renew my US visa in Dubai?

You have to:

Complete the online application form (Form DS-160).

Schedule an interview appointment at the US Embassy/Consulate.

Pay the US Visa Renewal Fee.

Submit the required documents for US visa renewal.

Enter the visa renewal interview.

Can I renew my US visa outside my home country?

Visa RenewalsYou must renew your visa at a U.S. embassy or consulate abroad. Only diplomatic visa holders and their dependents may renew them in the United States.

How do I renew my US visa online?

Here's the 7 steps to renewing your US visa:

Check if your visa is eligible for renewal.

Submit form DS-160/Online nonimmigrant visa application.

Check if you qualify for a visa interview waiver.

Pay the visa application fee.

Send supporting documents.

Attend visa interview (if necessary)

Wait for a decision.

Can I apply to renew my US visa before it expires?

Do I need to apply for a new visa after my current visa expires or can I apply in advance? You do not have to wait until your current visa expires. You can apply for a new visa even if your current visa is valid.

How to renew US Visa without interview | Appointment free | Michael's Hut

Sources: Stack Exchange - This article follows the attribution requirements of Stack Exchange and is licensed under CC BY-SA 3.0.

Images: Jenis Christopher, Aleksandar Pasaric, Kostiantyn Stupak, Aleksandar Pasaric