@pixelsage If you're not getting a single call back from any job, there's something wrong with your CV or you're applying to the wrong jobs. Do you have any acquaintances that can give you a referral?
I personally would try to find a new job immediately, preferably one that's tolerable at least, and stick with investing in ETFs. Single stocks are a gamble (unless the stock is Microsoft, lol), you can't fast-forward your savings.
I also don't think the four ways you list to FIRE are the only ways to FIRE, but I do think that some people need to adjust their expectations about what's possible. Like, you can absolutely get to a million in say, 15 years, if your income stays exactly the same, but it sounds like you are hoping to skip ahead and be done faster. You could also FIRE with less than a million, especially if you're targeting Greece or south of France (Spain?), but it sounds like you don't want to compromise in either direction?
I'm completely alone
I also gave up on dating
This sounds really rough, and definitely not sustainable, so back to the compromises point, I think you need to reevaluate what an ideal life looks like for you and balance all the saving you're doing with actually living a little. Like, what's the point of being retired if you never make any meaningful connections (obviously, some people don't care about that, but it sounds like you do, that's why I'm talking about it). I think therapy is a good option to help you explore what you want your life to look like, and I don't mean just post-retirement, but also right now.
Obviously this is just my personal opinion, hopefully you'll find at least a little bit that's helpful. Good luck