I added too much cilantro to my sofrito how can i correct this ?

There is really no way to remove an ingredient once added to a mixture. However, the most reliable way to fix it is to make another batch of sofrito - without the cilantro - and then combine the two batches. Use half for your current dish and freeze the other half for a later meal.

Since the onions etal are already sauteed, the freezing won't have any serious effect on the texture.