Berber can’t be fixed. The carpet has to be cut and notched around each of those posts and seamed back together. Once the loops are cut on the Berber, it will never seem back together without looking like shit.
Do not replace with Berber carpet.
If an installer shows up and he sees Berber, he will either walk off the job, or triple the price of the install. That shit should be banned. (And yes, I used to lay floor coverings amongst other things)