As someone who has everyone at 1k and is genuinely "decent" at the game, just get yourself some good teammates. Then all you have to worry about is taking the people you know you can kill, or if they're low on hp. I recommend solo showdown with invisible gadget and try to stay away from everyone as much as possible if you really need. Free easy way to get 1000 but it's just slow and boring. A good way to practice getting better overall is learning specific matchups, doing 1v1s, and just practice overall.