Build your project first and have a minimum viable product (MVP). Once that's done, you can then reach out to possible angel investors or even crypo-launchpads such as Binance or TrustSwap.
TrustSwap in particular have already launched and helped a bunch of projects reach their goals and I think they are more approchable than Binance. You can learn more about TrustSwap here: https://trustswap.org/
After that, it is only a matter of good marketing strategy to further promote your project and potentially gaining even more investors.