Write down 10 of your TODOs that generate income. As per natural law, it's likely that 1-2 of those TODOs will have 80% of the impact while the other 8-9 will have almost no impact. Now here comes the interesting part. You propably already know the 8-9 tasks that have almost no impact, but as per another law, those are also the easiest tasks (checking mails and such). On that list the TODO that feels like the biggest hassle and you least want to do will likely have the biggest impact. Sit down and just do it. Now, without delay. That already makes you more productive than 98% of your colleagues.
1. Longer hours at work
2. Same hours working but adding time learning
3. Ruthless optimization of time at work.
4. Working smarter (which probably means learning new skills).
5. Doing stuff that makes you uncomfortable. E.g. honest feedback, applying 2 levels above current, hand up to lead messy project etc.