Need to get one of my websites seo'd

I need my site https://www.stressedparent.co.uk/ seo'd. Have done google ads in past, this is one of my landing pages: https://www.stressedparent.co.uk/landing/change-your-childs-behaviour3
and have sorted keywords, but that is as far as I've got. The work i do is very specialised and niche: working with child to parent violence.
I have a track record of working with adopted families for last 10 years and now opening up my e-course to a wider audience.