From the top of my head, in order of importance:
1. Your perspective is unique - no one else shares your exact point of view. Try everything.
2. Master digital marketing: Google & Facebook Ads, Server Side Tracking, Google Tag Manager, and Analytics. Recommended communities:
- reddit.com/r/PPC
- measure.chat
3. Keep creative talent in-house (designers, developers)
4. Study pricing psychology (eg. kolenda.io/guides/pricing)
5. Good books with warstories:
* Influence: The Psychology of Persuasion by Robert B. Cialdini
* The 22 Immutable Laws of Marketing & of Branding (2 separate books) by Al Ries
6. Learn accounting essentials, each country has its own system
7. Provide solid support via multiple channels (phone, email, chat, social etc)