2 months struggle to achieve consistent masked frame-by-frame inpainting... my experience so far.. maybe someone can help

Hello diffusers, Some of you could see my other post complaining about sizes of models, later I realized its not the size I struggle with it is just I cannot find a model that suits my needs. so is there any at all? For 2 months, day by day, I am trying different solutions to get consistent video inpainting (masked) working. and I almost lost hope My goal is, for testing purposes, to replace walking person with a monster.