Lego
Fitting small bricks together takes fingers that obey and a patience that is not always there. When a half-built model collapses, the whole game can capsize. The pictures below break the build into steps you can manage one at a time.

Lego
Three stacked lego bricks in red, blue and yellow.
About this visual support
Lego bricks look simple but ask more of the hand than you would think. Lining studs up with holes, pressing evenly and bracing with the other hand is fine motor work, and just as the build starts to resemble something, one brick can sit crooked and the whole thing tumbles. For a child who has already struggled, the collapse can be the last straw.
Visual support makes the build easy to oversee. When each step sits on a picture, first the base, then the walls, then the roof, the child does not have to hold the whole plan in mind while the fingers labour. Taking one brick at a time and seeing real progress becomes easier.
One tip is to keep a picture for what to do if something falls: breathe, gather the pieces, restart from the last complete step. A collapse then becomes part of building rather than a failure. In the Routined app you can place the pictures in the order your own set follows and let the child tick off each part as it is finished.