Failed to get growth after 2 years of trying (photo)

3 years on fin, 2 years on min and microneedling with derma roller and switched to dermastamp, not as good results as others I saw here but I wanted to ask what you think was my problem?

Good microneedling requires a controlled amount of damage to induce the healing cascade that brings on hair growth. With the frequently used derma stamps and derma rollers, enough injury is frequently not created to get the best results. That could be the way you are using it. Try the Dr. Pen, 36 needle divide, depth 1.25 mm, and hold it in each area for 10 seconds once a week. That might make a difference.