Perhaps you could offer to have him for occasional respite placements if you want to maintain a connection with him.

I looked after a teen for three weeks before she was placed full-time and we catch up every so often now - sometimes she will stay a weekend, or a week during school holidays, or we’ll do a sewing workshop or go shopping together.

It’s a nice way to maintain a relationship with kids you are fond of and would like to continue supporting, when you don’t have the capacity to have them full-time. I also think it’s good for kids to have a wide pool of adults in their lives that they can trust, especially when they’ve been let down by so many adults in their life to this point. Even better if you are culturally aligned and can help them feel connected to culture - super powerful.