Once a year means visibility will be quite low outside of the day you upload and a few days after. If you are choosing up upload annually, you are choosing to prioritize your own comfort and enjoyment of creating a comic over better visibility.
It is completely up to you, but uploading more often or less often comes with a cost.
Upload more frequently = More appearances on Fresh, Newly Updated, more opportunities to get new readers, and retain readership in the SHORT term. More stress trying to keep up with a frequent schedule.
Upload less frequently = More time for yourself to think, plan, write, draw, and just enjoy making your comic, but readers will come EXTREMELY slowly, and retaining readers will be even more difficult in the early chapters because they will likely leave or become inactive in the 264 days between updates. You may not gain regular fans until 3 years down the line, with people being able to binge 3 episodes at once.