OpenBGP multihoming problem with incoming route

[Defoe]

I have 2 ISPs connected to my pfSense router with BGP, namely HKBN and HE

HKBN has good connection to Asia and many countries but has limited bandwidth to US and cost a lot more per mbps.
HE has good connection to US but not Asia.

I want to config my traffic from/to US via HE, and my traffic from/to Asia via HKBN.
I was able to direct outgoing traffic with set localpref but failed to direct incoming traffic with set metric / set med.
Is there a way to determine route automatically by ping?

# This file was manually created with the help from Reiner030; use no umlauts/special chars!
AS 132597
fib-update yes

network 103.16.26.0/23
network 2001:df0:465::/48

neighbor 59.148.193.1 {
descr "HKBNv4"
announce all
remote-as 10103
local-address 59.148.193.2
set localpref +100
set metric -10
}

neighbor 27.50.33.1 {
descr "HEv4"
announce all
remote-as 6939
local-address 27.50.33.2
set localpref -100
set metric +10
}

neighbor 2001:470:1:215::1 {
descr "HEv6"
announce all
remote-as 6939
local-address 2001:470:1:215::2
}

deny from any
deny to any
allow from 59.148.193.1
allow to 59.148.193.1
allow from 27.50.33.1
allow to 27.50.33.1
allow from 2001:470:1:215::1
allow to 2001:470:1:215::1

# dont forget one empty line after last command to let it work