Yes, voting matters, because sometimes elections are very close. Making sure good candidates take office is very important, because corrupt leaders can create large problems, and destroy economies. A good leader is critical to the function of society. Citizens should take this responsibility seriously, and make sure to vote after researching candidates.
I think voting matters to a certain extent however what matters more is there voting options. I think if voting were to stop there would be a huge uproar so I do not think I would say that it does not matter, it might not be as effective all the time as we would like it to be but nonetheless it matters.