My regret is I read this while it's still ongoing, now what do I do?

Cry while waiting for the next chapter with the rest of us.
Promise yourself to be patient this time. Break the promise.
Be depressed as soon as you reach the last upload...
Still worth it. Still regrets it though. I'm so dumb T_T

There’s always the novel, i think there’s one if I’m not mistaken.

Yes there is. Raw are complete but it hasn't been completely translated yet either...
Cry again.

https://www.novelupdates.com/series/i-delayed-my-death-because-of-a-will/