If you can get a job offer with a work permit then you change your visa. The author hasn’t said that he wants to work but I suspect that’s the intention.
It’s unlikely that you can. With 60 day exemption plus 30 day extension then a border run you’ve covered almost 6 months. Keep doing that and you’re likely to be stopped.
Look at DTV. If you can get work online then you can do the ‘digital nomad’ thing