You're going to have to understand a bit about your router before going ahead.
It looks like your "WAN" interface is eth0.2. If so that is what you'd need to modify.
man tc on a "desktop" Linux machine, or on the web, will help you understand what qdisc is installed and how it is behaving. For example, http://man7.org/linux/man-pages/man8/tc.8.html
Understanding add/change/replace as well as show will be needed to modify the settings and confirm them.
That seems rather roundabout to achieve low latency, but in the spirit of encouraging experimentation I would recommend to use bfifo instead of pfifo, as queue size in bytes is better correlated with transmission time than packet count as packet size ranges from around 64 to around 1500 bytes, typically.
You could also experiment with setting fq_codel's interval parameter to less than the default 100ms if you want tighter control.
Going for really short buffers without meaningfull AQM will certainly cut down on queueing delay, but at the cost of increased packet loss and reduced throughput.
Please run tc -s qdisc and tc -d qdisc to see what "limit" your pfifo instances use.
Also note that you can use sysctl to set/change the default qdisc in your sytem: sysctl net.core.default_qdisc will show the current default, sysctl -w net.core.default_qdisc=bfifo will change that default. To make changes persistent over booting you could also simply add
net.core.default_qdisc=bfifo to /etc/sysctl.conf (or create that file if it does not exist yet). Whether pfifo/bfifo are reasonable defaults for your use-case is a different question, and one you can explore yourself.
Please note that that user also uses SQM on the wan port... https://forum.netduma.com/topic/11538-possible-fix-for-lag-compbufferbloat/?do=findComment&comment=93657
"Wow, I took your advice and implemented sqm to the wan interface, I kept pfifo qdisc for lan Ethernet and wireless and the game plays even better, I had a really bad lobby where evryones ping was going up and down and still managed 36 -6, even melting shot gunners lol, think we may be on to something here, thanks for the advice."
you are correct i forgot to mention i will run fq codel on wan as well
like it show on that link you read i wanna set it up the exact same way
as its been a long time ago that thread was written
and i always wanted to try the exact same setup for myself
to me it looks like pfifio is set up on my wan i think
but you guys know best
as i typed this in yesterday
tc qdisc add dev eth0.2 root pfifo limit 3
so i think may have worked
i just wanted to as this question as well if i wanna reset my router back to when i first instaled openwrt so i get rid of alll the coommands i typed in
would thia comand do the trick i know it gets rid of the software i downloaded on router
this here firstboot && reboot now