It would be better to make the Constitution unamendable than to let people like you get their hands on it. People are just not smart enough to foresee the consequences of their choices, so it's better to stick with choices that at least worked once.
If you try to make the Constitution unamendable, you guarantee that the Republic that is founded on the Constitution will eventually fail.
I can't think of a worse idea for the long-term health of the Republic.
Do you want to be in a US without the Fourteenth Amendment?
Actually it strictly immutable without any of the Amendments, no 1st, 2nd etc.
That it's been done numerous times in the past suggests it is quite far from immutable.