"What's worked for people with aphantasia tends to split into breath/body-based (Vipassana, tai chi, breathwork), sound-based (music, mantra, frequencies), and present-moment attention. Guided-visual meditation almost universally being the thing people abandon first.
Here's some community perspectives on the topic you might find interesting:
Meditation with Aphantasia (https://aphantasia.com/article/stories/meditation-with-aphantasia) Liana Scott dropped guided meditation entirely and moved to sound and mantra. In the comments, people land on Vipassana, breath-watching, and insight meditation (attention to present sensations), with one good point: match the practice to your dominant mode instead of defaulting to visual.
Meditate With Aphantasia (https://aphantasia.com/article/strategies/meditate-with-aphantasia) Jim Collison's catalogue of non-visual options: breath, mantra, gazing, nature, even tai chi and knitting as moving meditation.
"Seeing" Dragons (https://aphantasia.com/article/seeing-dragons) Auri'An Lay is a total aphant who works as a meditation therapist, building journeys from "Knowing" rather than seeing. The comments are also a good honest debate about inner monologue. There's a sample non-visual meditation in this one."