I haven't received my tax refund for '23 - I received 2 letters asking me to wait another 60-90 days as there has been a delay in processing, no details. Should I refile?

No don't file again.  You just have to wait for the IRS.  They have your return and are working on it.   Keep waiting.  

@jon-lado 

If you have an economic hardship, you could see if the IRS Taxpayer Advocate Service will assist you, if you wish.  They are especially prone to help if there is a hardship or if you keep getting continued delays without any info from the IRS.

https://www.irs.gov/advocate/who-may-use-the-taxpayer-advocate-service