merge two accounts

I have 2 accounts, one I made a few years go and one I made a few weeks ago. All the coins I added today I accidentally added on my old account. Is there a way to merge these two accounts together, or do I need to re add all those coins to this account?

Hello,
I can merge the collections of 2 accounts. Please send me the old user name and the new username so I can make the change.