Based on your clarification on Marcus' reply, I would say perhaps: We are going to keep working to become the second best sales team. Seek = find. You don't just find a rank like that. You usually want an article, e.g. 'the'. 'position' only works if that is how it is known in the company. In that case, it's OK. But if you want to be more clear, you need to be more explicit. If you want to be brief, rather than clear, perhaps: We are going to keep working to be second best in sales.

Um.. it seems unclear. Can you tell me more about what you are trying to convey?