You must apply (or reapply) for a U.S. Tourist (B1/B2) visa on the U.S. embassy website. You do not need an agent if you can read and write. Applying does not equate to approval. All who apply are presumed ineligible. There is no guaranteed visa approval (regardless of who fills out your online visa application), and the grounds for any prior denials must be overcome. Your eligibility for a visa depends on your personal situation where you legally reside, not on anything anyone in or outside the U.S. says or does. I have several posts on my page on tourist/visitor visas that you should read.
WHAT ARE THESE VISAS FOR?
Tourist visas are strictly for short visits for pleasure – you must overcome the presumption of ineligibility. If you are applying for the visa to work, seek work, study, relocate, or give birth, you are not eligible for a tourist visa, and will be denied. The interviewing officer decides based on your personal situation in your country, as revealed in your visa application and your past trips to the U.S., if any, whether you are likely to violate the visa conditions (such as you may be seeking employment in the U.S., coming to give birth, or you are likely to remain in the U.S.).
A visa does not guarantee your admission into the U.S., the CBP officer at the port of entry is also required to explore your intentions and to deny admission. It is a judgment call for the embassy consular officer and the CBP officer. They may get it wrong, and deny you, but they'd rather err on denial than approval. If you are not employed, underemployed, and do not have compelling reasons to return home, e.g., every member of your immediate family has a visa), you will not get a visa; thus, applying with your wife and kids is likely to result in denial except if you have substantial legitimate financial/business ties in your country.
HOW CAN I HELP
I provide reliable visa advice and/or help in telephone/WhatsApp consultations. The first step is to book a telephone or in-office consultation with me. You can book your consultation on my website (peterloblacklaw.com), my Facebook page, my app (which is available in the AppStore or Google play store) anytime-day or night, or by Calling any of my Florida law offices during business hours. The Telephone Consultation fee is $100. I handle immigration matters throughout the United States and at all U.S. Embassies and Consulates.