Not sure if this helps but I found it interesting. I’ve heard several times over that selfing is not the best option for breeding but I first came across the term Single Seed Descent recently from a post by Diggy Soze with a video he posted on cannabis breeding.
The relevant part of selfing to increase homozygosity starts at 1:39:25
And the Single Seed Descent part is at 2:30:47
Not sure I fully grasp everything presented but it was an interesting starting point for myself. There’s obviously pros and cons to any method used.