I believe that there is an afterlife.
Why do you believe that there's an afterlife?
Because if there's no afterlife, life has no meaning.
On the contrary, having no afterlife makes your current life  important because you know that you will not get any other lives after this one. So this life that you have is it's the one that actually has all the meaning. That should make you want to live a great and fulfilling life.
I don't think so, the only option is that there's an afterlife.
You could be right about an afterlife existing and you could also be wrong. Everyone has the right to believe what is right for them and they are entitled to those beliefs. There is no absolute answer.