How do i rank up

This is a genuine question how do i rank up? Its like if I play good my team play badly? Honestly stuck in gold for so long but i always outfrag my plat teammates Rank game is more like your betting its a 50/50 (g2) 0rr I really do think that i deserve a higher rank then gold 2 but its like riot are intentionaly sabotaging my rank game lol