What Are The AI Tools You Used For Your Startup Business?

I'm starting a new ecommerce brand, but I don't have much budget, which is why I decided to go for SEO marketing and Facebook Ads for early stage promotion business. I'm limited to resources, and can't afford too much for copywriters or content creators, I learnt from a few more experienced sellers, and they recommend me to use AI for copywriting and AI Video Ads Creation, Any tools you will recommend?