All I can suggest is that you try varying the types of jobs you apply for and how you write your proposals to see what works best for you.
One thing I noticed when I was trying to build up my client list was that I got better response to proposals I wrote in the internet browser (not the app) on my phone. I tried to desconstruct what it was about these proposals that got better results, and figured out that I was using much Hi"shorter lines and smaller paragraphs on my phone because it was usually when I was out, and also it looked like a lot more words in the mobile browser.
I'm not saying this will work in your case exactly, but you should try experimenting with writing style, length of proposal, different greetings, etc. - maybe even try using your mobile if you find it changes your writing style. After all, you'v got nothing to lose.
Another thing I find useful when I need to find work fast is to filter my search results by adding "(urgent OR immediate) to the end of my searches. You won't get as many results, but they will all be people who are eager to get going on their project ASAP, so it may well get you up and running again. Once you have some more recent projects listed on your profile it will be much easier to get work, in part because you will have worked out what works well for you.
As far as your profile goes you seem to be in a very small niche. You may find that many of the jobs in your niche are in fact for the same clients, ones who have already (for whatever reason) decided not to hire you. Maybe you should branch out to include more areas, or set up some sub-profiles targeting different types of clients, e.g. business clients, academics, or whatever.
You might find that there are jobs that require a lot of translation or a bi-lingual freelancer that aren't advertised under the headings you're searching under. It very much depends on what the client thinks it should be listed under, and as we all know that isn't nescessarily always the most obvious tags or headings.
