One small change has helped me get past this — I make the design I think would work but instead of saying this is what it should be, I propose it as a potential solution, a how-about-this? It changes how the solution is seen, both by me and the person receiving it. It now becomes a promp…
In doing so, don't you fall in trap of ending doing everything by yourself. The solution in your brain is now ready for everyone to see and work with. Doesn't this in a way cut down their (other designers in the team) natural process of aligning their thoughts with yours. Now they can simply work with what you've provided because if a solution is given by design manager, it must be the best.
I do not wish to counter your opinion here but I feel 'how-about-this' is also not the ideal solution to the stated problem.