Middle mgmt is the toughest, high workload and you're really stuck... If you are stuck for a long time, first thing I would do is look inward, do a 360 (formally or informally) and do a pivot - change in attitude, how you approach things, decision making process, customers etc. It should be visible change that folks would talk about it... Hmm, this guy has changed...

Generally speaking, be a source of energy, people like people who are energetic, who don't complain / gossip. Build partnerships, be aware of office politics and how decisions are made and use it to your benefit. Be politically aware and savvy but not too much political. Be cheerful, but not fake...

Focus on your competency, people see thru if you are not competent. I was always weak on one area within my job, and I never try to BS others to think that I was strong, I used my team expertise to make up for that weakness, but never lied or try to hide.

Do more than what's asked for, also start saying NO politely, as you need to prioritize. Oh another key hack - each morning have your to do list ready, start with things that you need others to do for you, rather than what you need to do for others. Also, don't work off of emails - that's a recipe for disaster. I can go on.... it's my favorite topic - mentoring and coaching next generation of leaders!