How to become solution partner ?

KomathiPD 

Every Solution Partner Designation consists of 3 topics (and 5 segments):
1. new customers (for Microsoft)
2./3. certifications
4./5. growth and adoption

Depending on which Designation, eg. Azure, MWP, Bus.Apps., Security, the detailed criteria is different. But the structure and way of working is the same.

1. new customers

Provide licenses to a customer tenant that hasn't consumed that license yet, it needs to be a net new customer tenant for Microsoft. Taking ownership of a customer from another partner that already provided certain licenses, does not count for your points. 

The tenant also needs to meet the minimum usage threshold. Eg. for MWP Designation you need to provide a min. of 11 licenses to a tenant before that customer becomes eligible to earn points. 

2. & 3. intermediate and advanced certifications

Earn the right certifications for your Designation, on both intermediate level and advanced level. Make sure your people that earn the certifications are also correctly linked to your PartnerID: Link Microsoft Learn MCP ID to Partner Center account - Partner Center | Microsoft Learn

4. & 5. growth and adoption

Like it says, you need to keep growing your customer base. 

Of the provide licenses, you need to make sure the services within the license are used. Thus increasing the adoption of the services. Do you provide M365 Business Premium, this includes Intune. But if nobody uses Intune, adoption is low and you loose points. 

For growth it just looks are the overall purchased licenses which needs to keep increasing. If you provide 1000 (eligible) licenses right now, and provide 1100 licenses next year, your growth is +10%, thus you earn points for that 10% growth. 

Out of the 100 total points, you need a minimum of 70 points, and at least 1 point in each of the 5 segments. 

It's a real quick overview, hope it helps.