You might also check how other places avoided the industrial revolution for a long time:
China reverted both to agriculture and to isolation, stunting it at a near-industrialised level for a thousand or so years.
Europe was slowed down by religious fanaticism. Until competition from the Muslims forced the Christians to adapt. And even that was a slow process until Protestantism broke the monopoly of the church.
Africa was apparently a little to aggressive for industrialisation: Every attempt to hoard the necessary resources would quickly be met with a war lord who wants to take them over. Among other similar issues. Whereby outside powers did their best to help such tendencies. How about a little Venice-like country trying to keep everyone down by supplying war lords with weapons, selling drugs and other such backhanded tactics? You may call it perfidious mini-albion...
The Americas developed far slower because they were isolated. So make your continents smaller and more remote from one another, and everything develops much slower. You can do that after they reach your desired level, if you don't want them too different, for instance through a sudden rise in sea levels.
The Holy Roman Empire was always far too conservative, split and legalistic to have any kind of positive development (similar to the EU today). Give the whole world a central bureaucracy, and it will stay very unproductive...
Many European states made laws against factories because they didn't like the pollution with ashes from the coal furnaces. They were quickly overrun by their more industrious neighbors, though.
The Muslim world seems to have deteriorated through more and more strong-man ideology, after their intellectual elite concentrated in Baghdad and the Mongols eventually cut their heads off.
And so on, and so forth.