As a result of changes to the YouTube Partner Program requirements, your channel is currently no longer eligible for monetization …
Eligibility & program threshold
All YouTube creators can apply to join as long as the program is available in your country. Once a channel reaches 4,000 watch hours in the previous 12 months and 1,000 subscribers it will be reviewed to join the program.
This program threshold allows us to significantly improve our ability to identify creators who contribute positively to the community and help drive more ad revenue to them (and away from bad actors). These standards also help us prevent potentially inappropriate videos from monetizing, which can hurt revenue for everyone.