For an experienced tripsitter in the Randstad, start with Triptherapie. Their network covers much of Amsterdam, Utrecht, Rotterdam and The Hague, with multiple male and female guides available. You can review options and request a sitter via this page.
Choose a guide based on experience, background and your preferences, not only on who has the most sessions. The best match is the one you trust and feel comfortable with.
You can start with an intake to discuss intentions, practical details and fit. Travel range and availability differ per guide, so your exact location can influence who is feasible.
Hope this points you in the right direction.