I'm sorry you're having difficulty finding good partners,
Most of the things you mentioned in your questions are great strategies to getting some good quality prep in. In my time, I found that the alternative prep methods that added the most value for me were:
+ Listening to/watching case recordings online (high quality case content and delivery, of course!)
+ Self-practice when I wanted to hone specific areas (i.e., solo practising the communication a top-down, hypothesis-driven structure at the start of the case in a precise and concise manner)
I did not do the rest of the things you mentioned. I cannot imagine that reading business press is the most effective use of your time, and I would strongly caution AGAINST reading 2-3 Cases a day.
The single best form of interview prep you will ever derive is Case Practice with a skilled partner. You should solve for that. Unfortunately, once a Case is read passively, it can never again be considered an effective prep resource. Since the number of high quality Cases out there is in very short supply, if you read the best ones passively, you may find yourself in a bit of a quandry once you start to ramp up. There will be no good material left!
So, what can you do in the meantime?
1. Keep watching videos of well-simulated Case cracks.
2. Look out for print resources that help you simplify and better understand how Case cracking is achieved for high-performing candidates. Victor Cheng's suite was a tremendously helpful starting point for me.
3. Don't give up on good partners. Look for great partners right here on Prep Lounge. Once you find the few really good ones, keep them and keep practising with them!
Happy to help with any further questions you may have on this! :-)