2023 Ammendment eFile (fixing erroneous excess contribution) and 2024 Filing Procedure and Timeline

Hello,

In 2024, when filing my 2023 tax return, I by mistake reported an excess on Form 8889 line 2. I misinterpreted Form 8889 Line 2 & didn't contribute over the $3850 limit to my HSA. All contributions came from my employer (line9). I have my 2023 5498-SA as proof.

To fix this, must I do the following? :
1. Submit a 2023 1040X ammendment and send my 2023 5498-SA as documentary proof.
When I tried to do this yesterday on 01/15/2025, I was not able to e-file it. Should I wait until 01/27 to be able to do this or should I just paper mail it in now?

2. When doing my 2024 taxes now in 2025, do I just report excess as 0 as carryover from 2023? I am just not sure if I can file my latest taxes until the ammendment is filed and processed.
Should I file an extension this year and wait until the ammendment is processed? Or am I OK to proceed as if the ammendment will be approved?

Thank you so much!!!