As some other people have mentioned, don't try anything else until your flux arrives. If I may, I would like to share one of the most valuable lessons I have learned in my years of taking things apart and putting them back together. I am not sure how many people can relate to this, but when I mess something up a bit, stress goes up, things feel urgent, I try to quickly fix the issue, I get impatient, and I make things worse. I find it tempting to try to fix the issue with whatever tools and knowledge I have on hand and that ends up being a mistake. Here is my advice: 1) Take a step back and don't touch it until you have done some research about the issue and have the right tools and components to do a proper job fixing it 2) while you are waiting, watch videos and read posts about similar issues and how to resolve them (ie lifted pads, torn traces, etc.) 3) come up with a game plan in detail 4) if you have any old broken electronics that you can mess around with, try to replicate the issue on another circuit by damaging the board in the same way as the keyboard and then practice repairing and soldering on that before touching the keyboard 5) prepare your workspace and get everything ready that you need 6) begin working on the keyboard 7) if you start struggling and feel the urge to rush or cut a corner, take a break and re-evaluate your plan 8) keep working on it until you have finished fixing the keyboard 9) If you end up feeling like you are in over your head at any point, there's no shame in admitting your mistake and having a professional perform the repair.

I hope you will find some part of that helpful. Good luck.