I´m a trader and fly a Type-9.
So I guess you want trading and not combat. And that you're more interested in player interaction than making maximum money. This is what I do. It may not suit you.
Sometimes yes, people will ignore you (specially near rare trade stations as they tend to be in grind mode and just lose focus of everything but the trade run),
Rares traders often wait in stations for 10 minutes, waiting for the next batch of rares to arrive. This is a good opportunity to chat, You can start by asking them about their route. Or if they have seen any pirates.
Park the Type 9 and buy an Asp. A well-equipped Asp is ideal for rares trading. It can escape from almost anything and it's more fun to fly than a Type 9. Mine has no weapons and is built for speed and shields,
The only player interaction I´ve got were the pirates who interdicted me, just want my loot or kill me instand without saying anything.
This is a problem, and I think it's getting worse. If I get interdicted by a player who doesn't communicate, I send a series of messages such as "Please talk to me", "Can you hear me?", "It's very bad manners to shoot without sending a demand and threat". Sometimes it gets a response. You need a key macro program, such as AutoHotkey, so you can send prepared messages quickly while flying.
Not everyone speaks adequate English, but there's no excuse for a pirate not to send a prepared message, even if it's just CTRL-V to paste into the Chat panel.
It's fun evading and escaping pirates. Sometimes I succeed, sometimes I don't. Check the Chat panel for dangerous ships (especially Clippers and FdL) and watch for suspicious behaviour. Emergency drop from supercruise and boost away from the drop point is a useful tactic if someone is about to interdict you. Or I can let them interdict and either comply or run.
I run the NVIDIA Shadowplay so that after an interdiction I can save the last few minutes and watch it again, to see what I did wrong.