How to get more money to grow snowball?

As you may know, insurance companies' "float" is the great source of cheap money for Buffett to continuously grow his snowball. But for retail investor, like me, how to get more money to grow the snowball?

So far, I have to still depend on salary, suffer the work pressure and wait for every month same amount salary. I know I can rely on it to be rich, but at least it can cover my daily expense and continuously inject money to my investment pool.

Other way to do it? Maybe dividend is one of them, so I try to look for high dividend yield stocks, at least 5%. So even market up and down, at least I can get some new cash to invest when stocks are "cheap".

Any other suggestion?