You should get lower milk teeth extracted. For closing gap you have two option braces and crown n bridge. If you choose braces it will close gaps without need for trimming of natural teeth but will take 1 to 2 year for same. On other hsnd if you choose crown you will get quick result but little tooth trimming is required.

You need an x-ray.... The lower teeth are poorly maintained...and need extraction. You may need frenectomy.... And orthodontic treatment

Hi Need to get an xray done..  It is a full mouth x-ray known as OPG. Then we can think of various options as per your requirement. Braces, laminates etc.

Need x ray ,you may required frenectomy and than orthodontic treatment, if you want fast result u can also go for crowns, Lower teeth need treatment ASAP