try not to stack your pawns unless necessary. on 8bxc3 it opens access your backfield. Qxc3 would have allowed you to keep you backfield protected as well as allow your bishop to advance to d3 as well as open the king side castle. try to make moves that will develop you pieces quicker. remember a deffense is much easier than an attack provided you set your pieces right. if you develope your pieces well enough then you will see your pieces will be in much better position to attack. try not to repeat moves. ultimately we are here to learn and get better. making different moves even if you lose is going to get you much further than repeating. hope this long winded answer helps in some form or fashion.