Why it takes so long for IRS to send my taxes? I applied in january 2023 and my tax return is still being processed.

Only the IRS and your State control when and if a Federal or State tax refund is Approved and Issued.

Once a tax return has been Accepted by the IRS or a State, TurboTax receives no further information concerning the tax return or the status of any tax refund.

After the tax return has been Accepted by the IRS (meaning only that they received the return) it will be in the Processing mode until the tax refund has been Approved and then an Issue Date will be available on the IRS website.
See this IRS website for federal tax refund FAQ's - https://www.irs.gov/refunds/tax-season-refund-frequently-asked-questions

IRS - When to Call Us

Call us about your refund status only if Where's My Refund directs you to contact us.

IRS phone numbers and tax help options

TurboTax gets no information after you file your tax return.  Only the IRS is in control.

To call the IRS:IRS:  800-829-1040  hours 7 AM - 7 PM local time Mon-Fri

Listen to each menu before making the selection.

First choose your language. Press 1 for English.

Then do NOT choose the first choice re: "Refund", or it will send you to an automated phone line.

Instead, press 2 for "personal income tax".

Then press 1 for "form, tax history, or payment".  

Then press 3 "for all other questions."

Then press 2 "for all other questions."  It should then transfer you to an agent.

TAX ADVOCATE

At the following IRS website, find the USA map and click on your state, and it will give you the number of your area's IRS Taxpayer Advocate.

http://www.irs.gov/uac/Contact-a-Local-Taxpayer-Advocate

Also see this article for more info on how the Taxpayer Advocate Service works::
http://www.irs.gov/taxtopics/tc104.html

https://www.taxpayeradvocate.irs.gov/wp-content/uploads/2020/08/TAS_CaseCriteria_061120.pdf 

https://www.taxpayeradvocate.irs.gov/can-tas-help-me-with-my-tax-issue/