You could visit late 1700s or early 1800s and start a company that makes renewable energy. Maybe something like wind power, wave power etc, should be achievable with the technology available at the time. If your company becomes successful enough, you could compete fossil fuels out of the market. Then, invest that money into developing energy storage technologies to outcompete the internal combustion engine.
That’s a good idea, and it could make a one way trip worth it if it meant becoming super powerful. I’d also focus on medical technology, and maybe computing.
Although I’m a bit unsure of whether I could really create enough broad social change just from that. My goal would be liberation for people of all races, genders, and sexual orientations, the dismantling of capitalism and power structures, etc.
The other option would be to do far back enough so that I could be some sort of god king, which would be a lot more work technologically, but might be easier to create a religion that would canonize my instructions.
