What tools and strategies can help people with ADHD to better organise their time, increase their concentration and achieve greater productivity? Help me to understand and find a way to get better at work. Share your experiences and tips!

ADHD can make work difficult, but there are many tools that can help. Start by minimising distractions: turn off notifications on your phone, create a quiet workspace.
There are many apps that can help, but in my opinion Voiset is one of the most convenient https://www.voiset.io/blog/how-adhd-affects-workflow . Don't be discouraged if things don't work out right away. It's important to find your own strategies to help you focus better with ADHD and succeed at work.