If I resubscribe to quickbooks Self Employed, will my transactions from before the time I cancelled be available? I used it for 6-7 years and cancelled it 3-4 months ago

Welcome to the Community, @Jon11_2.

Yes, the transactions will still be available, as QuickBooks Self-Employed retains them for one year after cancellation. All you have to do is to login to your account through a web browser. Then, follow the on-screen instructions in the prompt to renew your plan. 

I'm also adding these article to learn how to assign your transactions on the correct line of your Schedule C:

• Categorize money transfers in QBSE
• Categorize transactions in QBSE
  
  

On the other hand, I'd like to share that QuickBooks has a Solopreneur product that serves the same functions as Self-Employed but with improved features. If you're interested in its features, you can check out this article: Introduction to QuickBooks Solopreneur.

Feel free to revisit this thread if you have additional QuickBooks concerns.