H1B Approved - Need to Withdraw the application and go for OPT extension

[learnb2b]

Hi all,

I have a strange situation. I have applied for my H1 and got for 6 months. In the mean time I got to know from my Designated school official that my program is included in STEM so I can avail 17months OPT Extension. So I applied for my OPT extension too, i got my OPT extension for 17 months today.

So I want to cancel my H1 from my employer as it is for 6 months.

01.If I cancel my H1B this year, will it be any problem to apply for the next year.(Will they deny my H1 next year because I withdrawn my application).
02. If I cancel my H1, Can I avail total 6 years of my H1, If I get my H1B approval next year.

03. If I withdraw my H1, will it impact my employers rating at USCIS.
04. IF I withdraw my H1, Do I need to leave my current employer?

Please respond. Thank You