As I said, anything that's not search ads. Youtubers, influencers of any size, UCG, podcasts, newsletters, you name it. LinkedIn content. There's thousands of options. Or if you do want to throw money at US/Chinese big tech, then TikTok, or Apple, or Reddit ads. Industry fairs. It entirely depends on where your niche is.

Of course if you're the next YC B2B SaaS raising big series then sure go burn your VC cash on Google Ads, but that's clearly not what OP is doing, or really most of us.