PIP award ends after 3 years, process for reapplication?

Hi
Can anyone help me please!
My condition impacts me badly neurologically so its a nightmare researching information. It would be helpful if anyone can guide me here. My pip award ends next month.

I was awarded standard pip & noticed they wrote on there they would contact me 1 year before ends. I appealed the standard mobility & just before the tribunal they awarded me full points on mobility & changed my end date of the award to a year earlier. However before the end of award date there is no mention of them contacting me on the latest one as they had on the previous award.

I had been waiting for them to send me a review form, as yet received nothing. Its only 6 wks until it ends. Am I supposed to reapply from scratch?

Thank you!