Tail lights wore out

Other than buying a high quality set of LED’s with a higher lumen output, you should take a look at the reflectors in the tail light housings. The reflectors can accumulate dirt and corrosion over time, which will dim the lights. A good cleaning may help, but if they’re corroded you can also repaint the reflector area with a bright aluminum or “chrome” paint to restore the reflector surface. The more light the reflector in the housing reflects the brighter the lights will be.