Abolishment of serfdom as a general practice in a England didn’t require government intervention it was actually outcompeted as strange as it sounds. By the time the law changed relatively few people where directly impacted.

This is part of a long term global trend which relates to the overhead of slavery and then serfdom. Serfdom outcompeted slavery in Europe because it was simply more efficient, and Serfdom in turn failed for the same reason.

Child labor was more an outgrowth of the industrial revolution which initially reduced the need for complex skills or physical strength. Kids going back thousands of years would help with harvesting etc, but it was also common practice to pay tradesmen to take on apprentices because child labor was effectively worth nothing when averaged across a year.

It was only when jobs got ultra specialized that child labor became valued. Though eventually flipped back where collage students are talking unpaid internships because Google etc has no use for their services. Obviously collage students can do some forms productive labor, but ignoring the law what can 10 year olds do? Acting and here it’s surprise surprise perfectly legal in western countries for 10 year olds to actually work. Suggesting it’s more a question of economics than morality.