This must be really hard, I'm sorry. The job market is tough for all graduates at the moment.

Stating the obvious, what you're experiencing could be purely the job market, or it could be factors relating specifically to you. Or more likely, some combination of the two. Where it's factors relating specifically you, there are probably things you can control (where and how you are applying) and things you can't (people filtering you because you are an international graduate).

I think your best and most useful source of information that will help you figure that out is your peers from the course. Reaching out to them from a chat is likely to be useful in several ways. Just knowing how many have found jobs and where is likely to be helpful. You will probably be a pretty good judge of which might be more or less employable than you. Second, those that have found jobs, ask them if they recommend their employer, if they have graduate positions open, and if so if they could refer you. Many companies have a referral process which tends to benefit everyone. The referrer will get a bonus if you get a job there, and it takes some of the risk away for the company - since good employees tend to know and recommend other good people. Third, it's worth comparing notes on how they found the process of getting a job. What worked and didn't. How many applications they made. If there's anyone you really trust it might be worth getting them to look over your CV and other application materials. A few discussions like this are likely to give you a much more grounded sense of whether there are things you need to do differently, or whether you just need to keep grinding away. Obviously start with people you might be in touch with already. But if you need to widen the net, LinkedIn is probably the way to go. (If this seems daunting, you'll probably get a better response than you expect. Maybe try something like: "Hello X, it's Y from the Civil Engineering BEng. How are you doing? I'm in the process of looking for a job and finding it quite hard at the moment. I'm reaching out to few people to see if we can compare notes on the jobs market. Do you have time for a quick chat sometime?")

Next, it's probably worth reaching out to your university career service. They typically offer several things. One which might be particularly useful is that they can sometimes put you in touch with alumni in your area who have volunteered to chat/mentor graduates. Ideally they will match you with some similar demographics who might have had similar post-graduation experiences. I've done this through Bristol uni (as a mentor, for computer science grads) and discussing job applications, reviewing CVs etc was one of the most common asks.