‘Untrustworthy’ is just about the worst label you can have if you are someone who aspires to lead others. If others think they can’t trust you, they will be reluctant to develop a relationship with you, which then means they are unlikely to follow you.
The best way to earn trust? Simply do what you say you will do. Anything other than delivering on your promises will lead to you getting a reputation for being unreliable, which means that people won’t be keen to trust you.
If you aren’t 100% certain you can deliver on a commitment, you are better off not making it. If you let people down, particularly if it’s more than once, you will get labelled.
Make sure every time you say you will do something, you follow through and do it. It sounds too simple, but it makes a big difference.
Cheers
Greg