Can you tell me more about a dimensional anchor?

Dimensional anchor completely blocks extradimensional travel. Forms of movement barred by a dimensional anchor include astral projection, blink, dimension door, ethereal jaunt, etherealness, gate, maze, plane shift, shadow walk, teleport.
Sounds helpful start to stop control time traveling. If I want to stop it.

link

If you looking for real-world help rather than game-world help, I’d look for serious real-world metaphysicists and not D&D. I do know a few good ones. Seems to me that magical practitioners, shamanic practitioners, hypnotists, and past-life regression folks might be potentially useful, if you find good ones and tell them your full experiences.