回複：H4回國3個月以上，會不會影響以後辦綠卡，來了6年沒回去

Should not be too hard, since the H1 is still in USA.
If the VO wants any new document, the H1 can help.

However, since you have been in USA for 6 years, you had better do some preparation before your Visa interview.
For example, most likely the officer may ask you this question: " why you do not come back for 6 years?".

Do some homework before you go to the interview.
Good luck!