What is the sign that a trader can start trading full-time?

Having enough wealth to a certain extent, or possessing a high level of skill.

Monitoring weekly K-line, observing fluctuations across different timeframes, down to five-minute and one-minute charts.

When, after a week of monitoring, you feel no sense of gain and are still in cash.

When you realize that others' wealth accumulation is a gradual process spanning generations,

and it has nothing to do with the market's short-term volatile K-line movements that lure you in and out.

That's when you can patiently enter your chosen market and start steadily building your position.