Walaykum wasalam wrwb. First and foremost, *do not* assume that your friends will go to hell. They might be sinning excessively right now, however *they might be guided in the near future*. *as a friend, your responsibility is to make dua for them and for yourself*. no matter how many *good deeds* we do, it might be that they are more sincere than us by heart. we cannot and do not know what is in their hearts. Make dua for those certain friends, call them to the deen, even if it takes you many many years to do so, do not become lazy of it. Help them see the beauty in the deen and so on. Besides when we go to jannah(InshaAllahu ta'ala i hope we do), we will not be sad or miserable, even if the people we knew end up in hell. Because Allah swt instills love and peace in your heart in jannah. you won't be worried nor will you be filled with anxiety and sorrow. wajazakAllahu khayran for interesting thread.
again just try to help them see the beauty of the deen and try to get them back to it.