I have a new website and I'd like to make use of 3 old websites of mine not in use anymore. They're all at least 5 years old and have DA30+. I want to turn them into the start of my pbn. However they're not niche related to my money website in anyway. All the content has been removed off them for about 6 months now. Should I add content that matched their old niches or add content that matches my money websites niche? Or a mix? What are your thoughts?