UPDATE: Lost funding and leaving the program. I continued my search and tried to establish contact with around 10 faculty of interest. Most did not even reply to my emails. Contacted gradutate coordinator and could only receive a rejection response after then. At the end of the semester they stopped my funding. To be frank, they did not even tell me that they will discontinue my funding. I heard from friends that they received TA offers. Emalied ask for my funding status to get a reply.
All in all, I realize that this was the best thing for me, as I got rid of that toxic, unresponsive, unsupportive and uncollaborative environment. Program expects me to find an advisor, but how could I get one if I doomed to failure from the day one. It was a mistake to go there. (I dont remember my Acad SE username, thats why updated anon).
I am an international PhD student at a top 50 computer science department in the United States. Due to COVID, I had to start in Spring which was a tough time for everyone. So I thought that the situation might change in Fall. Since then I have been trying to find a PhD advisor, but I can't seem to succeed on this. I have tried to reach a wide range of professors (related to my research interests) in order not to leave any stone unturned. Probably, I contacted around 10-15 professors. Some never replied after multiple emails with a range of more than a month or so between them. Some said they were out-of-capacity. Some were always asking to be convinced, while continuously accepting other students to their lab. Some say that they don't know me. Some vaguely mentioned if an opportunity arises in the "future", but also recommended me to check with other faculty. Here they used the exact word "future" without any certain dates etc.
My GPA in the program is 4.0 and I already have some publications from my Master's in my country. Master students with much lesser qualifications than mine get research assistantships, while I can't even find an advisor. I don't have the network of researchers known to faculty which might be a reason for them to be uninterested. My country is not as developed in research as countries such as India or China with lots of international connections.
I need to find an advisor ASAP because I might get unsatisfactory progress and lose funding. To be frank, I have totally lost my hope in finding some suitable advisor. I don't even mention funding issues and having to serve as a teaching assistant during all of the PhD.
My question is should I leave the program after this semester without wasting more time and energy and getting stuck in the end? Also, if I apply to other PhD programs in the US, will I be perceived badly by the programs, since I could not get an advisor in my current institution? How are students applying from other universities considered? Another option is completely forgetting about getting a PhD.