How to convince people that their design could be improved. Say "How about if we..." instead of "You should...". What to do when other team leaders keep askin

How to convince people that their design could be improved. Say "How about if we..." instead of "You should...". What to do when other team leaders keep asking you for help. Tell them to ask your manager so he can set the priority of the task. How to work on multiple projects at the same time. I found it helpful to have a prioritised todo list for each project with a master todo list covering the most urgent or important tasks for all of them.