Hello @Suhail Ahamed ,
The free sandbox sessions for practice are no longer available. You can check out the latest update on this here : https://learn.microsoft.com/en-us/training/support/faq?pivots=sandbox#are-sandboxes-still-available
Since you already have exhausted your test subscription, you would have to unfortunately move towards Pay-As-You-Go plans to use/learn Azure Resources.
Additionally, if you/your usage fall in any of the below plan categories and you are eligible for it, you can apply for the free subscription and avail the Azure services.