You may want to contact a Taxpayer Advocate in your area. See this IRS website for Taxpayer Advocate - https://www.taxpayeradvocate.irs.gov/ or call 1-877-777-4778
Just because the 2024 return has not been processed does not mean you cannot file a 2025 return
Complete and file the 2025 return as you normally would and when asked for th3e 2024 AGI enter a 0 (zero) since the IRS has not processed the 2024 return.