Thank you Meiyun for sharing and welcome to the group! 
It was wonderful engaging with you on our call(s) to better understand the requirement. I am documenting some of our conversation here so it can be shared with others also who might be thinking through similar challenges.
The first step we did was map out the key stakeholders.
The next step was to take a few key stakeholders and start writing out what will be the benefits that they can expect/need from the solution
For example for the partnership lead is shown below. Similar benefits need to be mapped for other stakeholders as well.
The next activity we did was try to imagine the solution as a bunch of registers. This helps us see the value of individual registers that a CRM can offer to future projects, ideas.
Considering the above use cases, we would recommend the following few that you could explore
- ERP Next has a robust CRM component. https://erpnext.com/ and you could use their Frappecloud.com for as little as 750 INR per month to host your own instance. ERPNext - All in one solution for your HR, Finance, Inventory, Donors, Inventory, Projects, and more modules
- https://civicrm.org/ CiviCRM
- Salesforce for non profits (Free for NGOs with upto 10 user licenses)