*I dont main support but this is my feelings on the role*
Most people underestimate there importance, just like i use too.
Most people think you play support if youre not good enough to play other roles and want to be carried up in elo, which i think is completely wrong. A good support can "carry" a team just as well as any other role on the team.
Think about it, how many games have you seen where an adc is wrecking mayhem on your team that has a BAD support all game? most of the time not very often, 90% of the time the support makes the ADC shine brighter..
A few problems i think people make when they play support is they let their adc make the first move or make all the calls. Imo the support should be making the moves and the adc following up. this require good communication. for example if i see the enemy has a sona(being so squishy) i right away tell my adc, at level 2 focus sona for the kill.(also depending on what support i play but since i play taric alot, level 2 is the ideal level) which when i communicate like this i usually have success in winning bot lane with my adc more times then not.
People also say playing support is boring, and these are usually the players that dont understand or fulfill the entire role since when i play support im usually busy the whole game and dont have time to just "zone out" . Now just speaking from my person opinion as playing as the support you should be keeping ward timers of enemy teams, pay attention to where they place wards and alert your jungler when they are placed. you should be watching the mini map to be ready to alert your adc if a gank is coming in since some people get caught up in last hitting they get tunnel vision. you should also try and coordinate a dragon capture after a you get a kill on bottom. in other words, be the leader support your team make a difference!