First I'm going to talk about why time is an illusion. It's obviously just a tool for measuring the day but I am going to provide an actual explanation. And it will save some people from wasting their time on thinking that time travel is a thing. You can think of reality similar to an infinite algorithm of code (assuming that reality is never going to end.) Each line of code represents all of the events that occurred within a particular moment. Thinking of "time passing by" is an illusion. It's more like events are occurring. I'm assuming that you guys know what coding is since I'm too lazy to provide another example. Why do events occur? Well, picture an ice cube falling onto your kitchen ground. The force of gravity + the weight and mass of the ice cube are the main factors of what causes it to fall. You can not go back into time and undo that event since it already happened and that's not how reality works and because time is just a tool. Time has nothing to do with reality. If you were to go back in time then you would have to undo every single event that happened throughout all of reality. Yeah, that's not going to happen. There are infinite possibilities for what can happen in the future. All of reality is information. This information is just possibilities. It's not physical or real, just a collection of possibilities. Even energy is information. This is also something that you can research. I didn't come up with it myself. I don't know if I was listening correctly but I heard Leo say in his "Radical implications of oneness" video that we will be everyone one day and experience their lives. I'm sorry if I was listening properly but if I was then I'm afraid that that's not going to happen because of the information I provided above. Reality would have to repeat constantly and do the same exact things over again, only this time we'd be a different person. Again, reality is information, an infinite set of possibilities. If reality restarted then it would be completely different.