Best way to make gold using plat?

[Befs]

I've been farming lockeds for over a week and its getting tiresome. I am about more than half way to make the amount I need (grinding for aegis), but I realized I havent found a real use for plat yet (vanities for plat are ugly and all those chests have bad loot) and I have 240 plat. Whats the best way to spend some of that for a nice boost to my gold? From what I saw, buying 10 luck kits and selling them seems efficient. Any better way?

Key crates and special events are the best ways.

Keys > Elixirs

By special events I mean like the avengers vanity weapon packs.