I can only understand your "disillusionment" if your expectation was that all requirements could be met within the budget.
What don't you like? Why? - Living/dining and kitchen area is too small for us; utility room door to the outside; dressing room not positioned in front; no sliding door kitchen/dining room
You can enlarge the living-dining area with a sliding door by moving the utility room to the north and assigning the gained space completely to the kitchen and dining area. This turns the rectangular floor plan into a rectangle with a utility room appendix. That costs extra. In this process, I would rotate the house about 15% clockwise.
Positioning the dressing room in front is possible if you design this room as the only access to the bedroom. This would then be at the front in the hallway. Of course, you then lose so much space in the dressing room that not much is left for clothes... Unless you simultaneously change the size and location of the children's rooms and take some space away from the living area again.
The plot is apparently non-standard in shape. I wouldn’t strictly stick to standard rectangles if the budget allows. What would bother me is that every visitor coming from the garage side would have to pass by the bedroom to reach the entrance. As private as the areas are separated inside, outside that is not so ideal.