These lead gen tools are soo expensive!! Whats a good alternative? (I will not promote)

I am a solo founder and at this point in time solo guy doing everything, development, design, marketing, sales etc. I am trying to use lead gen tools like clay and full enrich and dammmm these are expensive! 150$+ for month. And the ROI on thay investment is sketchy as i have not yet got one single successful meeting out of these. I am trying to see if there are cheaper alternative for someone at my scale? How do i improve my conversion rate? I am currently only focusing on getting 5 business who will collaborate with me and become my design partners so i can add features and functions that actually solves someone's need. Whats the best way to do this? Cold email or linked in outreach or something else?