Over the years I've built over a dozen unsuccessful sites. They get 10-100 visitors per day each. The topics include all kinds of random things - recipes, hiking tips, military equipment, gym bloopers, etc. I don't really need these websites anymore.
I recently launched a new business and I'm trying to figure out a Google-safe way to send all the visitors from my old websites to my new business website. While most of the visitors may not be interested in my new business, some of them may be interested and could convert to customers. I'd instantly get a few thousand new visitors to my business website.
Is there a safe way to redirect visitors from my old websites to my new website so that Google doesn't penalize me?
I've spent last couple of days reading about SEO best practices and it looks like it's very risky to 301 or even 302 redirect visitors from old sites to a new, unrelated site.
301 redirect will carry the all the associated link-juice to the new site but since my new site is unrelated to old sites, Google will penalize me for having a category mismatch. My new business has nothing to do with gym bloopers or military equipment.
I read that 302 redirect doesn't carry link juice, but after more careful investigation I found out that in some cases it actually does carry link juice the same way 301 does. (Here's a case-study about that). This method also looks unsafe.
An idea that I've is setting up a funnel page, such as "TryMyBusiness.com", then 301 redirect all old websites to this new funnel page, and then just have a banner ad with a link from "TryMyBusiness.com" to "MyBusiness.com". This however can be classified as doorway-page right? Which is prohibited by Google as well.
All these methods feel unsafe. If Google penalizes my new business website for doing the redirects then it's a dead business. Is there a safe way to just send visitors to my new business site? My gut feeling is to just let my old sites die and focus on the new business and build links and get visitors from scratch.