Why do people ignore me at work?

Most often it isn’t about whether people value your work. They simply don’t yet think of you as someone whose input changes their decisions, so they don’t think to ask, include you, or wait for your view.

What’s usually going on

Colleagues sort each other quickly: the person who gets things done, the person who sees the big picture, the person whose opinion settles a debate. If you’ve been sorted as a dependable doer, people may rely on your work while rarely seeking your judgment.

Input that arrives late, after a decision is already forming, gets treated as a footnote. And contributions made quietly, in the work itself rather than in the room, often never reach the people deciding.

Once that pattern sets in, it feeds itself: you’re not asked, so you speak less, so you’re asked even less.

What you can do

Offer a recommendation before a decision is made, not a reaction after it.
Put your reasoning in writing, briefly. A short note travels further than a comment in a meeting.
Ask one trusted colleague what would make your input more useful to them, and listen to the answer.
Notice who asks you for what. If it’s always tasks and never opinions, that is the gap to work on.