I'm like this too. Unfortunately, my company closed their Toronto office a few months ago because people weren't going in enough. So, now I'm basically WFH permanently. We do have a WeWork space we can use but that's only for specific meetings.
I have been working from home full-time since the start of the pandemic. I'm not sure I agree my productivity is that much less in terms of my overall output. The difference for me is when I do the work.
When I was going to the office every day I worked roughly 9-5 (or a bit either side) then...