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Yes you can still file a Joint return for 2024.  Then For the next two years following a husband's or wife's death, the surviving spouse can file as a qualifying widow or widower if they have a qualifying child. That basically lets you continue to use the same tax brackets that apply to married-filing-jointly returns.  After the year of death if you don't have a child you file as Single.

For next year 2025 tax return you should start a new account and not transfer from 2024.