I dont want to block the traffic.
I just want to provide 200 Mbps bandwidth on Youtube, Facebook, and WhatsApp.
OK, so it's not application blocking, it's application throughput shaping. Actually similar concept ...
The point of what @anav wrote is that ROS is not up to precise application identification so you realistically can't do anything based on identification of application that's using a particular connection (and this includes both bandwidth shaping and blocking).
check this code
Prioritize Whatsapp, Facebook and Instagram traffics using MikroTik RouterOS
https://youtu.be/P4IWdn_2K-E
/ip firewall filter
add action=add-dst-to-address-list address-list=Facebook address-list-timeout=4d chain=forward comment=Facebook content=.facebook.com
add action=add-dst-to-address-list address-list=Facebook address-list-timeout=4d chain=forward content=.fbcdn.net
add action=add-dst-to-address-list address-list=Facebook address-list-timeout=4d chain=forward content=.facebook.net
add action=add-dst-to-address-list address-list=Instagram address-list-timeout=4d chain=forward comment=Instagram content=.instagram.com
add action=add-dst-to-address-list address-list=Instagram address-list-timeout=4d chain=forward content=.cdninstagram.com
add action=add-dst-to-address-list address-list=Whatsapp address-list-timeout=4d chain=forward comment=Whatsapp content=whats.com
add action=add-dst-to-address-list address-list=Whatsapp address-list-timeout=4d chain=forward content=whatsapp.net
add action=add-dst-to-address-list address-list=Whatsapp address-list-timeout=4d chain=forward content=wa.me
add action=add-dst-to-address-list address-list=Whatsapp address-list-timeout=4d chain=forward content=whatsapp
add action=add-dst-to-address-list address-list=Whatsapp address-list-timeout=4d chain=forward content=.wa.me
/ip firewall mangle
add action=mark-connection chain=prerouting comment=Facebook dst-address-list=Facebook new-connection-mark=Facebook-Conn passthrough=yes
add action=mark-packet chain=prerouting connection-mark=Facebook-Conn new-packet-mark=Facebook-Packet passthrough=no
add action=mark-connection chain=prerouting comment=Instagram dst-address-list=Instagram new-connection-mark=Instagram-Conn passthrough=yes
add action=mark-packet chain=prerouting connection-mark=Instagram-Conn new-packet-mark=Instagram-Packet passthrough=no
add action=mark-connection chain=prerouting comment=Whatsapp dst-address-list=Whatsapp new-connection-mark=Whatsapp-Conn passthrough=yes
add action=mark-packet chain=prerouting connection-mark=Whatsapp-Conn new-packet-mark=Whatsapp-Packet passthrough=no
/queue simple
add name=queue3 packet-marks=Whatsapp-Packet priority=1/1 target=""
add name=queue1 packet-marks=Facebook-Packet priority=2/2 target=""
add name=queue2 packet-marks=Instagram-Packet priority=3/3 target=""