First Time Filer - no response from IRS - filed in March

Hello.

 

As I am a first time filer, I had to mail my federal tax form.

I mailed my form on February 29, 2020.

I have not received my refund.

I went to the IRS website to get 'my status'. It states 'not found'.

I tried calling the phone number. I was not able to talk to anyone.

The website states 'do not send a second form, processing is slow'.
I think 5 months is way too slow.

I mailed by state tax form and that was processed with no problem.

Any ideas or suggestions what I do now? 

Should I resend my form?

 

Thank you for any assistance.