I think you get 14 activity every two week period so yes that means you will get 28 activity per 4 week period and no more.

You have to do extra jobs, that's the only way, you can't get It for free. For example offer something that you are good at on the internet and have more knowledge than others or just work in real life and do some extra jobs and buy BTC for what you earned.

R.I.P Robin , you did a great job.

congrats with your milestone , 1000 posts is a really special achievement!