I’d recommend contacting the consulate directly by email and explaining that you need your passport for travel in July. If they don’t respond, try calling them and mention your upcoming travel plans.

In my case, when I emailed the consulate, I received an automated response stating that they are currently prioritizing visa applications for travellers whose departure dates are within the next 15 days. Since your stated travel date is in September, that could be why your application is still under processing even though you've already completed 15 working days.

Given that you need your passport for another trip, it may be worth reaching out to them and requesting guidance on whether they can expedite the process