What should I do if I am unable to perform ghusl after menstruation because there is janabah everywhere in the bathroom (the shower, the floor, and everything else), and also on my hair and body?

Your question is unclear, but you must perform ghusl (ritual bath) after your menstruation ends. It is not permissible to omit ghusl unless you fear harm to yourself from using water, in which case you should perform tayammum (dry ablution).