I don’t believe it’s been mentioned earlier, but Y Lolfa’s bilingual book ‘Gwneud y Pethau Bychain/Do the little things’ edited by Ffion Heledd Gruffudd could be good source of suggestions for what could be done to boost the language. While it’s principally aimed at what individuals can do in their own lives, this includes persuading schools, colleges, businesses etc to take on board a variety of suggestions which perhaps the government could equally press for ‘top down’.
More than likely any suggestions contained in the book would find their way into the consultation process anyway, but it’s usually wise not to take these things for granted!