Build up savings as a consultant, bootstrap a B2B SaaS for a handful of years (gradually transition out of consulting as the SaaS starts generating more income

Build up savings as a consultant, bootstrap a B2B SaaS for a handful of years (gradually transition out of consulting as the SaaS starts generating more income after some years). B2B is key since it's much easier to convince businesses to pay a subscription than consumers. Low burn rate during bootstrap phase is essential though.