Conversation

In many traditional systems, you did practices with form (e.g. visualization) for years before being introduced to the formless practices (with bare attention to breath being a preliminary to the latter).
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Going directly to formless practice is a modern (early 20th century) innovation that dramatically accelerates the process for people who can do it, but doesn’t work for everyone.
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I am not a teacher, so I can only speculate… Definitely trying different things seems sensible. But I’d say a day is not nearly enough to test.
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So trying a hundred things is not feasible. Perhaps 5-10. But they aren’t isolated methods; they are parts of systems, and have structure and function. Ask: “Is this method supposed to do something I want?”
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I guess when I asked the original Q you probably thought: "Jose's Q is a Q that assumes a premise (the goal of the practice) which he didn't ask for but he should have so here it is the question that I should have asked" (Which is actually correct)
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Not at all an expert here, but AIUI these phenomena require single-pointed concentration (samadhi), which would point to samatha practice. Say more about the breath "not working"? It may be that your concentration is too shallow to "see" breath-detail (that was me initially!)
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