How does one walks 20000-30000 per day?

Folks, please share your secrets - how do you get to do 20000-30000 steps per day? I'm especially interested in tips from those who work full-time from home in front of the computer 🖥️ 

So far my ideas are: 

1) Go for a 6000-7000 steps walk/run in the morning before my work starts and repeat the same walk in the evening after work. 

2) Walk in front of my computer while I work (my job allows that for 1-3 hours ever day). And maybe get a treadmill desk in the future? 

3) Be active during my breaks - do the jumping jacks, etc, etc. 

And still I get to maximum 15000 steps per day 😅. What can I improve/optimise?