These are pretty much all the design channels I follow. In no particular order:

1. Femke (Product Designer at Uber) - https://www.youtube.com/channel/UCWUGGwfTfJ0-2jUS3dZqOJA

2. Charlie Marie - https://www.youtube.com/user/charlimarieTV

3. Jesse Showalter - https://www.youtube.com/user/JesseAtomic

4. DesignCourse (Design+Development) - https://www.youtube.com/user/DesignCourse

5. Flux (Ran Segall) - https://www.youtube.com/channel/UCN7dywl5wDxTu1RM3eJ_h9Q

6. AJ&Smart - https://www.youtube.com/channel/UCeB_OpLspKJGiKv1CYkWFFw

7. Caler Edwards - https://www.youtube.com/user/CalerEdwards/videos

8. Christopher Deane - https://www.youtube.com/channel/UCRfTv-QsCHhx-S8kcOgO2dg/videos

9. Dansky - https://www.youtube.com/user/ForeverDansky/videos

10. Dann Petty (Legendary in Design Community) - https://www.youtube.com/channel/UCTOwGti_mRb2J1JfTdIkg_w

11. Pablo Stanley (InVision)- https://www.youtube.com/channel/UCZHkx_OyRXHb1D3XTqOidRw

12. Howard Pinsky (Adobe XD) - https://www.youtube.com/channel/UC48fSJKMFBka3Zl0u7DGf0A

13. MDS - https://www.youtube.com/channel/UCYMKd37bdxI-qj3f3z6U6_g