If you have more you can still use this method (3 accounts per instance)
⚠ This guide is for the app available here: https://desktop.telegram.org/ not the one in the Mac/Windows App Store. For the Mac App Store app this should work: https://gist.github.com/Nachtalb/ec590dc974f6ba4674972d4937b230be/#gistcomment-3611415 ⚠