Magic has been around for more than 2 centuries. Some tricks have been modified or customized by the magician and you can do the same so you are able to perform your own magic tricks.
For that, you need to list down all the magic tricks you know. You probably learned this by reading a book or viewing an online tutorial. You then figure out which tricks you can change slightly and get the same results. Sometimes, instead of using one prop it can be substituted for another.
The best way to do this is to work your way backwards by knowing what is the end result then working your way towards the very beginning. This should be practiced as often as possible to see that it really works.
Aside from making changes in the magic tricks, try to also modify your presentation style. This will make it look as though no one has done this before even if someone already did it. For instance, if you have never used a wand before, introduce it into your act.
The wand has been used by many as a way to distract the audience so you will have to time to make the trick work.
When the changes have been made, try to get a small group of people to watch your perform. This could be some family members or friends. After its done, get feedback from them and listen to what they say. If they like it, try to get another group to watch because you want to make sure that your routine will be entertaining when you put on a show.