Help with SFP/PPPOE

I cannot see anything blatantly wrong.

Do the clients receive correctly an IP address from the DHCP server in range 192.168.88.10-192.168.88.200?

Are you testing with a cabled (via ethernet) device or from Wifi? (in case test connectivity first through ethernet)

What does a traceroute/tracert to dns.gooogle.com show from a client device?

There are a few things to clean/correct (but unrelated to the issue you are having) in your configuration:

  1. Duplicate pools:
    /ip pool
    add name=dhcp-pool ranges=192.168.88.10-192.168.88.200
    add name=lan-pool ranges=192.168.88.10-192.168.88.200 <- unused and same as previous one

  2. Leftovers frome moving or renaming interfaces:
    /interface bridge port
    ...
    add bridge=bridge-lan interface=*10 <- leftover to be removed
    add bridge=bridge-lan interface=*11 <- leftover to be removed

  3. you have only some input rules in firewall, are you sure-sure that you want to run the router without firewall forward rules?
    (you really should start from the default Mikrotik firewall set of rules for SOHO devices[1])
    In any case you have some duplicated rules among the few input ones:
    /ip firewall filter
    add action=accept chain=input connection-state=established,related
    add action=accept chain=input in-interface-list=LAN
    add action=drop chain=input <- this is a "drop all else" anything after this in the same chain will be ignored
    add action=accept chain=input connection-state=established,related <-duplicated, remove
    add action=accept chain=input in-interface-list=LAN <-duplicated, remove
    add action=drop chain=input <-duplicated, remove

  4. it is advised to have a MAC set explicitly on the bridge

[1] that would be Rule #8:
The twelve Rules of Mikrotik Club