Stena Line and Irish Ferries have been running their regular four daily services from a single site, rather than the usual two.
A temporary timetable for the partial reopening has been operating while the second berth is being repaired.
But traders in Holyhead said they had seen a huge drop in footfall and earnings since the closure of the port, which sees two million passengers a year and 1,200 lorries and trailers crossing every day.
Stena Line said: “Work is progressing to ensure that the berth is returned to full operational capabilities as safely and efficiently as possible.”
It added that looking ahead, it remained committed to the “long-term resilience” of Holyhead Port and ensuring its sustainable future.
