But I would say that having one of the above in each category is critical.
Beyond that, it means that you are growing fast and/or you have an important database of clients, followers and you are spending a lot on advertising. Then you can add software to manage your ads, your social media platforms and content, a CRM (Client Relationship Management), etc.
Wondering what we do? In our case, we use an autoresponder (GetResponse), ClickFunnels, Canva, Photoshop, Promo, FunnelScripts, Google Analytics, BuildRedirects.