Special note - as a professional horticulturist with over 25 years of experience, I have developed several commercial products with compost as a core component. Here’s what you need to know: Compost is terribly inconsistent from a nutrient standpoint. Microbially, it’s awesome! But, essential plant nutrition needs to be consistent for the healthiest plants. The classic source is manure, but if you live in the city like me, you probably don't have farm animals either.
For best results, be sure to supplement your compost with organic fertilizers and soil food that have guaranteed amounts of N, P, K, and other essential elements. I only use organic inputs in my garden and there are several options available for purchase.
Conduct a soil test to determine how much to apply - either to your compost pile, or directly to your garden/soil.
This is especially important if you’re relying on compost to provide the bulk of your plant nutrients.