Explain the point of existence if you discovered everyone around didn’t exist, but were figments of your imagination.

My point of existence if I discovered everyone around didn’t exist, but were figments of my imagination  are a figment of someone's imagination, that would imply that not only could you also disappear into oblivion in less than a moment you, along with your friends, toys and dramas of life but that your entire reality doesn't really exist to begin with. So if I Take away “exist” and “existence” and we take away the prediction.
But we cannot take away “experience” because it’s right now. You cannot avoid what is already for certain. And you cannot doubt what you cannot avoid.

We can doubt the future and even the past, but we cannot doubt the present. It’s the source of all that we then decide exists. The present comes before the future and even the past.