at what point do you stop applying broadly and actually niche down?

Been applying to basically anything remotely adjacent to my background for two months with a pretty low response rate. A friend suggested narrowing to like 3 target company types instead and going deeper on tailoring for those. Feels riskier to narrow the funnel when nothing's landing yet, so still on the fence about it. Anyone actually tried switching from spray-and-pray to narrow and noticed a real difference?