What kills your productivity?

Hello everyone, love being in the group!

Hope I'm allowed to ask:

I know that many developers are struggling with productivity. Especially when they have too many projects to choose from. It can be hard to stay focused.

I’m building a small business as a consultant helping people with exactly that so I’m wondering, for all those that are struggling with procrastination and stress from too much stuff you have to do. What are the biggest stepping stones you’ve encountered?

PS: Sorry if this is slightly off-topic, just doing some research and would love to read some input!