Hey,
I have a speedrun for #12 for fastest solo win, and my IGN is Upsxrge, however my problem is that I got a speedrun #17th for fastest 4v4 Win with a party, but I got that speedrun with a different IGN back then, my ign back then was Pro_Upsurge, can you switch that speedrun to my account so it shows up on speedruns?
Proof it was my ign: https://plancke.io/hypixel/player/stats/Upsxrge
If it's your run, you need to submit it just like you submitted your current run. The mods may ask for proof that it's actually your run, and if you have the original video I would recommend uploading it under your current account to further affirm that it was you.
The admins of the site can't, and won't, do anything. It's up to you to submit your runs and deal with the moderators of the game if necessary.