Good tips to get your ex back?

I can't speak to your situation since I know nothing about it. But in general...

If you approach this with the goal of 'getting her back' you are almost certainly doomed to failure. Every contact you have with her will be colored and tainted for both of you.

Why? Because your actions are selfish. You're not concentrating on her comfort, her happiness, her best interests, but your own. You can't be open and honest because it will make you 'look desperate' - which you are. Your every move will be controlled by how it looks, how it sounds, how she'll take it. You're not having a friendship/romance. You are engaged in a campaign. A siege. She is defending against that. You aren't a lover, you're a battle commander.

The only way your efforts will be long-term successful is by concentrating on you, not her. Whatever happened between you is at least half your responsibility and as long as you continue to be that person who couldn't maintain that relationship, you are defeated before you begin. Save your breath.

Your goal should not be getting her back, but improving yourself. You may or may not ever get her back but you will, with effort and honest self-assessment, eventually become someone that SOMEONE can stay with.

There is hardly a person alive who didn't lose someone they wanted desperately. Yet many of them recover from that and find somebody else.

We say 'there's no one else but that person for me, ever. There never will be.' What we mean is, there is no one else who would be able to tolerate me like he or she did .., [i]until they left.[/i]

Examine why the relationship ended and how you contributed to that. Change those characteristics. Become someone who would not have been left. Then, if she does not come back to you, someone will come along for you.

Mostly what we want desperately from an ex is not them - we want proof that we were left and did nothing to deserve it - not really. Maybe we didn't deserve it. Maybe we just chose wrong.