Wtf, 300 HP for a downed dude, you are focusing on the wrong things, like way off.
Fix the inventory/looting and give us attachments so we can choose what weapons we want to use instead of giving 4-5 players overpowered shit while others have to do the end game with iron sights... Boom, you've fixed your game.
Most of these changes make no sense at all considering what other issues there are, have you ever played the game, how are these things even in a priority list.
Seriously, go play some other succesful BRs before making changes, not saying that you have to copy them but at least get some good ideas from them.
Oh and on this bullshit fix note, how about not drowning when downed if your toes even touches the water.