Reddit & Social marketing

I am a content creator and am wanting to promote the work that I do on both instagram and substack through Reddit and other online communities. Would you be interested in promoting my pages below with a view of generating more follows and subscriptions?

https://mattybmoney.substack.com/

https://www.instagram.com/mattyb_money/

tiktok.com/@mattyb_money

I would like to get Australian based audiences and following only.

Please let me know how you would approach this brief?