I repeat, there is no such thing as a 4 point Calvinist, there is only a person who accepts all five or who rejects them all.
It reads to me as though those who assert only a 5 point Calvinism is valid have only thought through one or 2 combinations of some 120 different permutations of the truth values of the 5 points.
Scripture by chapter and verse does not explicitly state limited atonement, but limited atonement is a conclusion drawn from reasoning a handful of Scriptures, while not introducing others. The argument for it may be better than that of double predestination, but neither is singularily Scriptural.
For these reasons I place it in His hands. If He wanted to provide unlimited atonement, who am I to deny He hasn’t paid for all sin?
BTW, even with unlimited atonement, don’t be fooled into thinking those who reject Him, don’t naturally become so heinous that the only feasible solution in the eternal state is not indeed condemnation to the Lake of Fire.
His Work is not good for nothingness.