I get the reluctance. You don't want to fail and waste money. Well then, go get a job and be safe.
Your business will grow only to the level of the number of...
You can do free advertising by sharing content, posting on social media, begging for RTs, etc, but that'll only do so much.
Platform sites restrict/limit how far your organic reach can go so they can monetize and earn too. If...
But refusing to advertise...
Dumb.
Be wise. If you want to grow, spend money and advertise your business. If you are afraid of failing because you don't know how, then find people who know how (there are tons of them) and who will do it for you for a small fee.
Be wise. I know you prefer wise.
👍🏾