if you don't feel no diffrent then keep use combo i think you not heavy usage
don't need change anything

my home result UNIFI 500Mbps

ping upos-sc-mirrorakam.akamized.net

Pinging upos-sc-mirrorakam.akamized.net [74.63.219.253] with 32 bytes of data:
Reply from 74.63.219.253: bytes=32 time=235ms TTL=49
Reply from 74.63.219.253: bytes=32 time=233ms TTL=49
Reply from 74.63.219.253: bytes=32 time=233ms TTL=49
Reply from 74.63.219.253: bytes=32 time=235ms TTL=49

Ping statistics for 74.63.219.253:
Packets: Sent = 4, Received = 4, Lost = 0 (0% loss),
Approximate round trip times in milli-seconds:
Minimum = 233ms, Maximum = 235ms, Average = 234ms

my office UNIFI BIZ 500Mbps

ping upos-sc-mirrorakam.akamized.net

Pinging upos-sc-mirrorakam.akamized.net [74.63.219.253] with 32 bytes of data:
Reply from 74.63.219.253: bytes=32 time=251ms TTL=46
Reply from 74.63.219.253: bytes=32 time=252ms TTL=46
Reply from 74.63.219.253: bytes=32 time=250ms TTL=46
Reply from 74.63.219.253: bytes=32 time=250ms TTL=46

Ping statistics for 74.63.219.253:
Packets: Sent = 4, Received = 4, Lost = 0 (0% loss),
Approximate round trip times in milli-seconds:
Minimum = 250ms, Maximum = 252ms, Average = 250ms

my home ip range 218.111.xxx.xxx
my office ip range 60.48.xxx.xxx

but i test ping 1.1.1.1 my home result is 7ms 6ms and i test ping 1.1.1.1 my office result 9ms 10ms

hmmm someone told unifi biz different unifi server capacity then home unifi server capacity

not issue unifi its you crap router if you reboot router to get solve after few hours will come back problem that mean crappy router due unable handle because cpu weak and ram weak that low spec

you need buy own router to get solve don't buy cheap
you 500mbps then take TP LINK AX73 enough

mine ASUS Router was paid RM8xx expensive its already too old 7 years still strong no issue 500Mbps i never reboot router
Uptime 27 days 20 hour(s) 35 minute(s) 23 seconds look near 30days i wont reboot
my router ASUS RT-AC68U already old but wifi 6 i always getting full speed wifi 500Mbps for 5Ghz

i suspect you crappy router issue

i had used crappy router for use PC always ethernet port LAN cable but few hours still slow and need reboot router back to normal after few hours come back problem to
so now i use my own asus router for use PC always ethernet port LAN Cable and tested never had problem always stable