Being Reborn Is Like Being a Lazy Fish

Reborn at the age of five, with powers beyond this dimension. I only wanted to live a quiet, comfortable life as a rich man. But then I discovered the world had changed. The aliens were full of malice and wanted to enslave humanity. What would you choose? Keep living as a lazy slacker, or slaughter your way through them and turn the world upside down? Or take a third path, endlessly bouncing between lounging around and slaughter.