so i want to do world tour any% soon but im scared if i get rid of my old save file ill have it gone forever do i nesesarly have to start over the game so i can do the run or can i just keep my save file there and still do the run

Must be from a clean save file, having everything unlocked from the get go would be a huge advantage. You can easily back up your save file and keep it somewhere safe on your PC until you’re done with the run.

Check out this guide for messing around with save files safely: https://www.speedrun.com/Sonic_and_All-Stars_Racing_Transformed/guide/phflz