It is not even first past the post that is the problem. Even if you had some sort of ranked voting or parliamentary system you would still end up with the same problem. The person in charge gets changed too frequently to be able to have long term plans. 8 years is too short to execute a plan that will take 10 or 20 years.

I think this is why FDR was a successful president and was able to get so much done. He had 3 complete terms and a partial 4th term.

If you are going to have shorter terms you need to have your successor continue with your plans, but in a liberal democracy you don't know who is going to follow you. Even if your party wins, your successor might not continue with the plan.

In preferential Systems you must chase the centre, in the USA it might be trains versus cars, in Australia because both sides are chasing the centre they will both agree on a train line it's just the specifics they will argue about which believe leads to better outcomes.

At least from my experience I would say change of government won't lead to cancellation of a project or reform just an expansion or contraction in scope.

You can't do something like implement a 1 child policy and stick to it for decades causing a demographic collapse because it wouldn't have broad appeal from the population.