What do you do if your attempts to communicate with colleagues and administrators are falling flat?

This is such an important step. Be careful not to overlook it. Sometimes, as humans when our ongoing interactions have been difficult, we tend to move right into action. Our feelings may cause more emotion with that action than needed at the time and we might not act strategically. Think about patterns you notice, feelings that you have around the situation and the persons involved. Then make a plan of action. Now you are prepared to thoughtfully tackle the problem.

I would add, it is difficult to receive feedback from someone you don't trust or don't believe has your best interest in mind. If you have doubts about trust with this person you're engaging with, take steps to prepare yourself to "hear" and not "feel". You already don't trust them so whatever is said will come through that lens or filter. One way to support yourself, is to acknowledge your concern (to yourself), plan a specific way you can help yourself to hear-then clarify-then make notes (use the notes after to reflect). The notetaking will help you to slow down your emotional reaction. The clarifying questions help to confirm what you think you are hearing.

I would add that as you receive feedback and more actively ask for feedback it becomes easier to use this as a way to improve your communication. Not everyone enjoys or responds well to every type of communication and being more aware of this will help you to craft your message in such a way that you come across the way you are trying to, rather than making the mistake assuming everyone reads or hears a message you way you intended it. So back to my original point, the more frequently you ask for feedbaxk and the more you hear 'uncomfortable' feedback the easier is will het to work with that and learn form it.

The key to effective communication is building relationships with your team. It is important to be approachable and understanding. To build relationships one has to also listen and not just instruct. Making team members feel comfortable will create an environment of trust. Get to know them on a personal level also, showing interest in their well being will create a culture where they will reciprocate by doing their job well because they feel appreciated. Create positive banter with the team , no one wants a toxic work environment especially with the stresses of factors like the current economy affecting everyone. A positive work culture with create happy team members and that will effectively result in positive outcomes.

Please do this. Work on what you promised yourself you would and set appointments with yourself to check in on how it is going.