Forced https

Hi, pls help me out. I am a beginner and on the go i did a mistake. i forced https intead of http in settings, and just after that website is down. also wp admin is down. unable to login wp dashboard. works are so important and time bounded. i need to solve this asap. please help me out. i tried renaming plugin file, htaccess file, deleting it, etc already. but not working. pls assist.