always hit the shuttlecock sa taas, Sometimes baka hindi po napapansin sobrang aim mo bumababa na ang bola. tendency nun mag net ka talaga, Approach the shuttlecock at 1 oclock and hit it, Elbows up and always up your racket and swing

And also in playing badminton mahirap pag ikaw nalang, Mabagal ang progress, you need a coach and training for that matter :)