If my refund was rejected by the IRS and I did not mail my return to them by the deadline, how can I finish filling my taxes? Can I still mail it out a month later?

I tried filling my taxes for the first time electronically and for some reason, my refund got rejected. Later, I realized I completely forgot to mail it by the deadline in April. I'm not fully sure how this works, and i don't see an option to try and file electronically again, so can I still try and mail it out past that deadline? I'm not too concerned with getting a refund anymore, I really just want to make sure my taxes for 2023 have been filled.