Change woocommerce order status from completed to processing by default

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WordPress

payment

Hello all coders,

As I am developing the website using woocommerce, I am facing the issue with that.

As soon as any of my client places prepaid order on my site, the order status is shown as Completed bydefault.
I want to change it to "Processing" instead of "Completed" status. Please help me to solve this problem.

P.S. I want to do so as my courier partner API do not fetch any completed orders from my woocommerce order panel. (I am using paytm payment gateway and Shiprocket as my courier partner.)

What I have tried:

I have tried to use any plugin available, but I didn't found any useful plugin...