Federal Return Pending After 11 weeks?

I filed my tax return at the start of March 2021. Received my state return within two weeks of filling. Received a confirmation from the federal return that it was accepted, but I have not heard anything back since. Every time I have tried calling through the different ways people have posted the system in the end just hangs up the call. I keep checking online and it says still processing on the irs website. Is there any way to contact them? Should I be worried I have no clue what is going on.