Best Objective for Retargeting?

I've built an audience using video views of 50% from brand awareness campaigns.

I'm wondering what the best objective is for retargeting. I could do conversions, but then I can't include Thought Leader Ads. Also, conversions are typically expensive in my B2B niche, so there will be limited data for it. Also, I would then need 4 campaigns, 2 for thought leader and 2 for conversions, brand posts, which is above my retargeting budget (minimum campaign budget).

I know you can add conversions still with any objective. Though I wonder your guys experience with conversion optimisation does it make a real difference?

Basically:

- Is it best to just run two campaigns, text and video, and include thought leader in these on brand awareness?

- Or run 4 campaigns, 2 for conversions brand, 2 for thought leader text and video on brand awareness or engagement?

Thanks in advance!