Your funnel has three numbers: clicks → conversions (CR) → euros per click (EPC). Each problem lives at a different point and has a different fix. Diagnosing before acting is the difference between optimizing and shooting in the dark.
Quick diagnosis
Few CLICKS → distribution problem: you publish too little or on small channels. More content, more channels.
Clicks but low CR → match problem: your audience isn't the product's audience. Change program or angle.
Good CR but low EPC → ticket problem: you convert cheap products. Look for programs with higher commissions per sale.
The Analytics panel gives you the full funnel (clicks → conversion by device, country and source), and the marketplace shows each program's EPC and quality grade so you can compare your CR against what the program does network-wide.