Battery Dead problems of the 2010 Mini Cooper

Air bag passenger light came on and stayed on. Windows down go up or down. Turn signals don't work. Ac stop working. It blows out hot air in the front. A loud thud noise happens once in a while from the back. Sometimes won't start like if the battery was dead. Sometimes engine won't turn off and will run without the key in the ignition. I've only had it since oct 2019.