Good luck and Godspeed! Write down every recent and upcoming success so you can cite objective improvements in your interviews/meetings. Customer feedback will help too. If you have any big clients who can vouch for you personally being the reason that your company kept their business, even better. The only risk there is that they may decide that you're too valuable in your current role, but you can get ahead of that by pitching that you'll be able to apply your success to bigger wins in a higher role and guide others to learn how to do what you've done. Worst case scenario, you don't get that promotion but you still have it all compiled for interviews elsewhere. If you want to be at the level of that promotion, you should chase it whether it's within the company or without! You got this!