Overheating problem, now the car does not start?

The vehicle did overheat while I was in transit, I parked it after a short while, I poured water into it, it emitted some smoked bubble as a result. I then drove it out but still noticed the smoke didn’t stop. I then parked it and called my mechanic to come check it.

He said the radiator too was broken as a result of heat; he also said the gasket was affected too.

We changed all this but now the vehicle did not start at all, afterwards. He then observed the coils were not shocking despite it supplying current. We changed 4 coils, plugs, starting censor, and used machine to test; machine detected crankshaft sensor error, which was changed as well.

Still yet the vehicle is yet to start. Now the coils are shocking but the vehicle is not starting still. The mechanic is obviously confused and suggests I change the engine or ring it.

Please help, I don’t know what to do.