which service to focus to grow

Would you share your thoughts about my options?
Currently I have a Facebook (fb) group that offers free monthly group coaching and also offer 1:1 coaching (paid) in decision making/achieving goals.
My goal is to grow members in my fb group and also grow my business in 1:1 coaching with the plan of launching membership/course in the near future.
I’m going to run fb ad, and wonder which service I should focus to grow for my initial ad between the free fb group coaching vs. paid 1:1 coaching.
Some ppl say I should focus on the outcome that will generate income, but either way I feel good about what I offer.
Any thoughts/suggestions?