How to know value to sell site for

I bought this blog website about lifestyle while ago.

traffic is ok and lots of new users subscribed so have a good subscriber email list.

Over 600posts and new posts posted often.

I bought it for about £320 but how do i find out how much to sell it for?

How much is it making per month?

You should ask in this thread: https://www.blackhatworld.com/seo/what-is-my-site-worth-official-thread.366563/