I changed bank accounts and all of my transactions from January 2020 to October 2020 are no longer here. Where did they go and how do I get them back.

Thanks for stopping by in the Community, @juliedelvis. I've got here two options to recover the transactions from a disconnected bank account in QuickBooks Self-Employed (QBSE). 

First, you'll want to use the WebConnect process to retrieve all of your 2019 bank info. Before that, I'd suggest contacting your bank to confirm if you can use this method since the account is already closed. If yes, proceed with the steps below. 

To export the 2019 transactions from your bank: 

1. Log in to your bank's website.
2. Follow your bank’s instructions to download your transactions as a CSV file.
3. Set the date range. 
4. Follow any on-screen instructions to finish the download.

To import the transactions to the program: 

1. Go to the Settings (Gear) icon at the upper right.
2. Select Imports.
3. Choose the account. 
4. Click Browse and find the file you downloaded from your bank. 
5. Select the file and click Open.
6. Make sure the Date, Description, and Amount columns on the file match the columns and order in QuickBooks.
7. Click Continue to complete the import process. 

Once done, go back to the Transactions tab and review the imported transactions. It helps you ensure there are no duplicates. For more information, see Step 4 through this article: Add Older Transactions to QBSE. 

After that, you can categorize and edit the transactions. This ensures your last year's financial records are accurate. For more details, check out this article: Categorizing Transactions. 

However, if your bank doesn't let you use the WebConnect process, I recommend contacting our Customer Care Team. They have the specialized tools to retrieve all the attached receipts and the rules associated with your 2019 transactions. Please take note that these will be assigned to the Cash account since your bank is already closed. 

I'll be right here to help if you need anything else. Have a great day.