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what is google adwords remarketing?

1. Title - Hack Mix Forum
2. URL - https://hackmix.altervista.org
3. Category - Game hacking, programming
4. Site Type - Forum (MyBB)
5. Description - Forum that share game hacks.

The empty categories are just added to increase the forum topics.
It has not been refreshed for 3 years cause of personal reasons.
Now I'm just came back to restart to manage it upgrading everything but I've realized how forums in general are declining. And it's so sad cause I love forums.
I'm here to know if I have hopes to make it a nice forum as it was, or better.
I'm aware that arguments are diffused to many other sites now, but I was in Italy one of the first to talk about these topics.
In the past I got visitors without doing nothing, but now it is the end: only bots visits my forum, from 40 to 200 bots continously online.

Please let me know how to forward to improve it. Thanks 

Hello guys, I'm just subscribed to this forum known first on DigitalPoint then on MyBB forum.
So I'm here cause I need an help for my forum.
I will create another topic on the right section hoping some kind person will teach me how to make my forum revive.

Anyway I am an italian guy, and I own a forum about game hacking, hacking in general.
I prefer to not say my personal info, just for privacy, nothing else