Email problems

I have 2 yahoo email addresses. They were accessible together. I could press my email tab and all mail boxes were available in that one as all mailboxes. On 9/07, 2023, the battery stopped working. After getting battery replaced, my email is divided. The email up to 9/07,2023 is still there. But I have to go to www.mail.yahoo.com, to get my mail since battery replacement. How do i fix combine it as before, without losing my old and current emails? Thank you, 1TexasSister