How to route by 2isp in LAN

Hello everyone
this is my scenario
Isp1: 85.123.55.151
Isp2: 77.32.68.142
LAN : 192.168.20.1/24

I have two isp , . I want to make different routing in my LAN . some ip 's route to isp1 and others route to isp2.
i think very simple scenario .
192.168.20.1-100 route to isp1
192.168.20.101-200 route to isp2
i don 't want to use load balancing or mangle ,

Just follow any load balancing guide, but where the new outbound connections are chosen based on something like PCC, replace the match criteria with the src-address instead of PCC.

Like this one. It uses two /25, but otherwise it’s exactly what you want.

thanks men . it worked for me . it’s exactly i wanted.