Raid Farm Trouble Shoot

Ive recreated this design in 1.21.11
https://www.youtube.com/watch?v=hhOXu1HRSq0
Ive tried numerous things but nothing seems to allow the farm to get past the first stage, which it rarely starts. Are there any changes I can make to make it function and stay simple? (This has been made on a server full of folks who aren't patient enough to go through more than 2 simple steps to use a farm). A retrofit would be preferable but if it simply isn't possible I would love a different design which fits within those criteria and produces a high volume of items.

TLDR; Is there a simple retrofit I can make to the attached farm design or a different design which has two to three simple startup steps.