Q.How to Enrich Soil Before Plantation/Sowing
What are some tips for enrichment of soil?

Certified GKH Gardening Expert
These articles will help you:
https://www.gardeningknowhow.com/garden-how-to/soil-fertilizers/what-is-soil-made-of-creating-a-good-garden-planting-soil-type.htm
https://www.gardeningknowhow.com/edible/vegetables/vgen/vegetable-garden-soil.htm
https://www.gardeningknowhow.com/garden-how-to/soil-fertilizers/how-to-till-a-garden-tilling-your-soil.htm

First thing I would suggest is get a soil test, otherwise you are shooting in the dark. Depending on where you live, most states have a very low cost sampling program. Without knowing what type of soil, PH, Acidity level, sodium level, etc. you would be guessing.