Peplink 1350 distribution internet

Hi team. I’m a newbie. I’m using the peplink 1350
My company have rent 5 line isp

ISP lease line 1: domestic: 200MB — foreign : 25MB
ISP lease line 2: domestic: 120MB — foreign : 10MB
ISP lease line 3: domestic: 150MB — foreign : 15MB
ISP lease line 4: domestic: 200MB — foreign : 10MB
ISP lease line 5: domestic: 250MB — foreign : 1MB

how can I optimize internet domestic and foreign
when the user uses the internet foreign use Lease line 1 after 3,2,1,5
Can you guide me

Hi. This is domestic/foreign split is a new concept to me.
Does it mean that the ISP on line 1 provides 200Mbps to in country IPs destinations and only 25Mbps to IPs outside of the country?

How much of your traffic is domestic vs foreign?
How can you identify domestic traffic?