PHP-FPM: pm-pools for 8GB/4CPU VPS where is 20 - 5000 users per day

www.conf

; DigitalOcean 4 CPU, 8 GB RAM
; PHP7.3-FPM
; If all pools hit in with full power there isn't enough RAM, I reckon.
;
; static
; Wordpress, 2000 - 5000 users per day
[www]
user = www-data
group = www-data
listen = /run/php/php7.3-fpm.sock
listen.owner = www-data
listen.group = www-data
pm = static
pm.max_children = 18
;slowlog = /var/log/php7.3-fpm-$pool.log.slow
;request_slowlog_timeout = 3
;request_slowlog_trace_depth = 20
request_terminate_timeout = 10000
;chroot =
;chdir = /var/www
security.limit_extensions = .php
pm.status_path = /status

; dynamic
; Wordpress, 100 - 1000 users per day
[dynamic]
user = www-data
group = www-data
listen = /run/php/php7.3-fpm-dynamic.sock
listen.owner = www-data
listen.group = www-data
pm = dynamic
pm.max_children = 18
pm.start_servers = 2
pm.min_spare_servers = 2
pm.max_spare_servers = 6
pm.max_requests = 800
;slowlog = /var/log/php7.3-fpm-$pool.log.slow
;request_slowlog_timeout = 3
;request_slowlog_trace_depth = 20
request_terminate_timeout = 10000
;chroot =
;chdir = /var/www
security.limit_extensions = .php

; ondemand
; Wordpress/Moodle, 20 - 500 users per day
[ondemand]
listen = /run/php/php7.3-fpm-ondemand.sock
user = www-data
group = www-data
listen.owner = www-data
listen.group = www-data
pm = ondemand
pm.max_children = 18
pm.process_idle_timeout = 10s
pm.max_requests = 500
;slowlog = /var/log/php7.3-fpm-$pool.log.slow
;request_slowlog_timeout = 3
;request_slowlog_trace_depth = 20
request_terminate_timeout = 10000
;chroot =
;chdir = /var/www
security.limit_extensions = .php