The provincial elections are also indirect elections for the 1st chamber of Dutch parliament, which also votes on laws. So it's important.

Forum did well in the previous ones and then fell apart, like all parties that grow big too quickly they attracted too many nutters. In Forum's case doubly so because its core are complete conspiracy / neonazi nutters already.

This time "BBB" will win big, they are a conservative populist farmers interest protest party. The same thing will then happen to them.

These parties won't get actual power but the completely splintered parliament of ~20 parties makes the country almost ungovernable.