Whether you believe in karma or name it as you like, it's true that everyone gets what they deserve. And if you aren't interested in changing for good to make this world a better one, at least do it in order to have a better retribution in life.
Here are a few changes I have made and still am working on some, that made me happier, improved my quality of life and at short or long term, get good karma.

Be open-minded

This is something you should work on every day of your life, since it doesn't happen overnight. But start with small things like talking less and listening more; accepting others' opinions and try to learn as much as you can from every aspect of your life.

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Don't open your mouth unless you have something good to say

Don't start rumors, try to lie less, DON'T CRITICIZE. Celebrate other's successes and help them in their bad times. I can't tell you how free I felt the moment I stopped criticizing others. It kept me out of trouble but also it freed my mind, knowing my conscious was clean.
Finally, stop feeling jealousy.

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Let your pride go

Know that you will not always be right, so learn to admit when you are not right to yourself AND to OTHERS. DON'T BE AFRAID TO ASK. If you don't know something, don't stay in that stupid place. Get your doubts out of your system, no matter who you have to talk with.

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Don't be shy / afraid of what others might say

I have experienced first hand the difference between shy and "courageous" people. In a trip I had with my friends a few months ago, they were afraid to do so many things because they worried about what people could think or say, and my best friend and I didn't. We took every oportunity to have a blast no matter if we made a fool of ourselves. Guess who enjoyed the trip the most? My bff and I! If you want to do something, GO FOR IT. We have short lives, and I like to live in a way which then I'll have stories to tell and look back and not regret anything. I rather have the "I'm so glad that I did that" instead of "I wish I did that".

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Clean your mess

Don't throw trash into the ground, PLEASE PEOPLE! Help our planet, it's the only place we have to live in. If you made a mistake or let's say you spill something, CLEAN. IT. Also, it might not be your mess, but if someone dropped something next to you or so, pick it up, don't just ignore it, you won't die if you do it!

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Don't do to others what you don't want them to do to you

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This is pretty much self-explained.

Be nice to everyone

Remember Selena Gomez's "kill them with kindness?".
Even if you are not in a great mood or you are mad at someone, it's not others' fault so treat them politely. And when someone is trying to pick up a fight with you, just ignore them, nothing will make them more mad and you will end up winning or they will simply get tired and stop.

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Learn as much culture as you can

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This can surprise you how much it will affect your life. The most intelligent people I know, almost always are the kindest. For what is more, a well exercised and rich brain is one's best feature possible.

Compliment when you like something

It is so simple yet it can really change someone's mood.

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Always be thankful

Appreciate EVERYTHING you have. Material and non-material. Thank your parents or your tutors for every chance they give to you. Thank, thank, thank. Give all of your belongings the value they deserve.

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Help others make these changes

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Start with your friends, your family, and if you can, with strangers. Let's contribute to make this world a better place.

Thanks for reading and happy changing!