If reincarnation is true, then why live a life you don't like? If someone's life is completely miserable, wouldn't dying on purpose pretty much work like a reset button?
To be honest and I'm somewhat embarrassed to say this, if I believed in reincarnation and had no doubts, I would turn to mindless self indulgence. Why would I worry about health if I'm destined to live another life?
This is because you are adding belief in reincarnation to your current belief system. But people who believe in reincarnation usually have other beliefs attached to it. Hinduism is, as far as I know, the main proponent of reincarnation. We do not need to believe that we must behave a particular way to gain Gods favour. We can do what we want, to be frank. However, there's a balance system. You can't have everyone self indulging and getting away with it. The Earth would not support this. When we act selfishly, it's generally at the expense of others and generally creates suffering. This is what we refer to as karma (actions much have some natural consequence).
So yes, you can indulge all you want, but not only will that likely hurt others, it will likely end up hurting yourself too.
In addition to that, we believe that our current actions will determine the circumstances of our future lives. If we are selfish and mindless people in this life, our next life (and perhaps many after) will not be favourable to us.
Hindus believe that the purpose of life is to become more aware until we realise our true Self. Our belief in reincarnation does not cause us to become lazy about our own lives. It encourages us to strive to gain knowledge, to become conscious of others, to be empathetic and generally better ourselves. This way we can reach our full potential and also go through life bringing fortune to ourselves and those around us.
ETA: Suicide would be a reset button but it would also be a complete waste of time. You would end up where you left off, since your state of consciousness and karma dictate your circumstances.
