Feel free to put forward some “evidence outside the Bible that would indicate a young earth” that you are willing to defend. Make sure that it doesn’t have any of the ‘flaws’ you use to reject other dating methods, lest you engage in hypocrisy. Don’t forget many here have seen all the standard PRATTs before and can identify the problems with them quicker than you can Ctrl-V them.
Otherwise there’s only your opinion, which isn’t worth anything.