Hello i need help here. I have a static IP from my ISP and i want to set my modem/router on bridge mode and i try several tutorial but it fails me to connect to the internet.

What kind of modem, connection type, info from ISP, etc? Also what did you try so far? The idea of bridge mode is that modem is there, but "pretends not to be", so you just apply settings (e.g. PPPoE client) directly to router, instead of modem and it works.

I wonder why are you adding one extra route in your network.

I assume it's a simple router as you have mentioned modem/router in your question.

if you still want to keep it in the middle just turn of the DHCP off of your modem/router & configure your static ip in your mikrotik.

I already solve the problem i just disable the dhcp client ehter1 interface where my modem is connected, just as i thought dhcp client is for dynamic IP. Then i just configure the IP route gateway.