You need to contact the KCC and/or U.S. Embassy about correcting the DS-260.

Who issued the decision on your petition/application? Was it the local field office or a Service Center?

Under the last action rule, the later approved petition is controlling.

Are you planning to join your former employer upon receipt of your green card? Does your former employer wish to employ you upon receipt of the...

It is important to not only act promptly but accurately. You should contact the KCC or U.S. Embassy about the issue.

There is not enough information to determine whether changing jobs at this stage will cause an issue. How long has your green card application been...

You should obtain an advance parole document before traveling outside the U.S.

You can apply for a new visa at anytime. Whether that is advisable is another matter. You will likely need a waiver for fraud as well given you...

No. Being engaged is not sufficient. You must be married. You may be eligible for a U visa.

You need to consult an experienced immigration attorney. There is a specific process that must be followed.