To use E-Cash Privately, you would first have to accomplish the first two layers privately, and self-hosted. Acquire KYC-Free Bitcoin, use silent payments, coinjoins, and payjoins, self-host, open, and manage your own lightning channels, then open a e-bank, etc. 🙃. Additionally, you'd have to swap back, and forth between various softwares since there isn't a software that I'm aware of that offers full privacy tools for all 3 layers. Cake Wallet, Zeus, and Peanut Wallets (Cashu wallets) are the closet tools that I'm aware of that do a fraction of each layer but I'm not aware of a self-hosted method that does all three in one app.