Keep in mind where and when you start the fight. If there are no other shooting around and you're near start of plane path (or any other place expected to have a lot of people (which funnily currently is definitely not the middle of circle, which is often empty)) - expect half the server to come running soon, most likely at least 1 team within 30 seconds distance from you.
Either don't start such fight at all, or be ready to fight much much longer and don't relax after you wipe the 2nd squad... It of course helps if you kept track of all your nearest opponent's movements (see where people land, know where plane went, where hotzone was, where dropship was moving, predict density based on zone popularity) and have a decent idea of when and where from to expect them when you start shooting.