Every week, I post a weekly photo. This can be a recent photo, or one I took earlier.
In addition, I also started to regularly re-post selected photos based on constructive feedback I received on the weekly photos. These re-posts also include a short discussion of the feedback, suggested changes, and the changes I finally made.
I also post my weekly photos on websites such as 1x.com and 500px.com, which quite often leads to constructive feedback on these photos, which sometimes triggers me to experiment with changes in the post-processing (light, colours, crop, etc, etc) of these photos.