Hi There,
Greetings of the day!
In regards to your concerns, Currently There is no free environment for developer as Salesforce. After 30 days you need to purchase license or another solution is,you need to use 30 days trail for development when trail is going to expire you will export unmanaged solution of your work & import it in new trail account & continue your development.
Note: In that case data/records you created is not export with solution.
I hope it helps! Let me know in case of any other concern.
Kind Regards,
CRMjetty
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