As XGS said there was no need to announce 3 months later, people move between ISPs all the time. You was clearly not at ease though, so for your own peace of mind you moved.
But in terms of your latency the biggest thing affecting that will likely be the wholesale backhaul your connection is going over and your geographical location, for reference here is my typical ping to a UK location on AAISP using cityfibre national backhaul. I know as an example I get higher pings over BT wholesale backhaul as their routing isnt optimal for my city.
Pinging cloudflare.com [104.16.132.229] with 32 bytes of data:
Reply from 104.16.132.229: bytes=32 time=4ms TTL=59
Reply from 104.16.132.229: bytes=32 time=4ms TTL=59
Reply from 104.16.132.229: bytes=32 time=4ms TTL=59
Reply from 104.16.132.229: bytes=32 time=4ms TTL=59
Ping statistics for 104.16.132.229:
Packets: Sent = 4, Received = 4, Lost = 0 (0% loss),
Approximate round trip times in milli-seconds:
Minimum = 4ms, Maximum = 4ms, Average = 4ms