How long do you usually stay awake when performing the MILD technique? Are you performing regular reality checks throughout the day? I’ve found MILD to be the most sucessfult LD incudtion technique myself, but that doesn’t mean that it will work for everyone. I’ve also found that it works much better if I perform regulat Reality Checks and keep my focus on lucid dreaming high.
Maybe try taking a break from the MILD technique, and lucid dreaming for a while? Take a few nights and just dream with no pressure, who knows you might just have a lucid dream.