Front walk cycles are hard, but here is my process for when I have to do a front walk.
Hope it helps!
you can download the rig here:
https://fabgioffre.gumroad.com/
0:00 Why Front Walks are Hard
0:22 The Main Poses of A Walk
0:59 The Ground Guide
1:20 The Contact Pose
3:00 Timing out the Walk
3:30 The Passing Pose
4:54 The Down Pose
6:14 The Up Pose
7:16 Adjusting the Heads
8:21 Adding The Tweens
8:41 Converting it to 2s
9:13 That Wasn't that Hard!
9:29 Marloo!