think i go A2A. the 4 and 5 are hogging some of your cards, and 6, 7, 4 and 4 are dead already. and it's not like you can't still make a diamond flush.
Looks to be 3-handed at a minimum, so I would keep A42ddd and flat. If only one player opened the pot I would raise, and if it stayed HU I would keep AA2.
brings it in, 5
completes, 6
calls.
4