Churn and Burn Websites Best Way to Redirect

I have made few churn and burn websites very thin just 1 page and I am already ranking on top spots for majority of keywords that I was targeting. So these websites are for the services that I provide myself. Now I want to redirect them to my main website.

I tried 302 redirects but after few days I saw that my ranking started to drop. I removed it and they started to come back up. This can be a coincidence but I have read alot, I never thought that 302 redirects can have such effects…

Churn and Burn Websites Best Way to Redirect