How to port forward without bridge mode

Hi im trying to access my pc over the internet behind mikrotik. Before installing mikrotik i can access my pc, i just configure port forward to my router/wan. Currently i install my mikrotik to my router/wan without bridge mode. and i can no longer access my pc over the internet. I follow some instruction on how to port forward on mikrotik but still no luck.

/ip firewall nat
chain=srcnat action=masquerade out-interface=ether2
add chain=dstnat action=dst-nat protocol=tcp dst-port=4899 to-addresses=192.168.0.85

i used this method but still i can’t access my pc.

wan public ip:122.x.x.x
wan local ip :192.168.1.1
mikrotik local ip:192.168.0.1
my pc ip:192.168.0.85

In your isp router, you will have to forward to the mikrotik ether2 IP address. I am unclear if this should be 192.168.1.1 or perhaps a IP from that range like 192.168.1.2.

Then on mikrotik change dst-nat to:

/ip firewall nat
add chain=dstnat action=dst-nat in-interface=ether2 protocol=tcp dst-port=4899 to-addresses=192.168.0.85

Assuming ether2 is mikrotik WAN.

You have very likely double NAT.
If you cannot use bridge mode on ISP router then try if setting DMZ is available there.
Or use IPv6 address of your computer for external access.