When attention is scattered, the wish to “get centred” can become another large task. Try something smaller.
Pause long enough to notice three things: what the body is doing, what feeling is nearest, and what the next honest thing might be.
The body may be braced, tired, hungry, restless, or difficult to sense. The feeling may not have a clean name. The honest thing may be a glass of water, a delayed reply, an apology, ten minutes without input, or admitting that you do not know.
Nothing needs to become serene. The practice is not to manufacture a better state. It is to reduce the distance between experience and attention.
Returning to yourself is rarely a dramatic homecoming. More often it is a series of small recognitions: This is what is here. This is what I can meet. This is the next thing that belongs to me.