[Help] I want buy this high DR domain

[igofirst]

So, I own a gambling affiliates website and I'm doing quite well. I found this particular domain from expireddomain, I badly want it because it's a good domain at least according to me. No spam, indexed by Google and high DR of 59.
It's good for SEO according to me.
Here's a few questions if you can answer I'll be grateful of.
1. I already bid thrice on Godaddy but seller not responding, Should I directly buy it or wait?
2. Should I completely shift my current site to this domain or I duplicate old site to this domain?
3. 301 redirect?
4. Redirect only top referring links to my old site?
Any other valuable feedback will be highly appreciated. Thank you
Attached screenshot, so someone can really help out.

 

[Biggie]

Hi

1. this is your choice, and only you can decide to reach out to owner or wait for it to expire... which I highly doubt it will soon.
2. if you're doing well, then stick with what you know best.

imo….