Using LTV and CPA to your advantage requires focusing on customer lifetime value as your guiding KPI.
With it, you can create ways to start selling more to existing prospects.
You can focus on creating email campaigns, remarketing to one-time buyers who haven't returned, or finding inexpensive ways to quickly boost sales.
Start investing heavily in your current customers. You already have them. Start pampering them by giving them upgrades and reasons to stay.
Genuinely invest in your success, and you'll see fax lists your average spending increase.
For example, companies like Slack use this strategy and only charge more for their service when your plan grows.