There are several critical skills to be a good BA. These skills were rightly pointed out on this article https://www.mindsmapped.com/business-analysis/skill-sets-of-a-business-analyst/

BA needs to have the following skills:

• Document or Project Interpretation
• Good Communication
• Organize people
• Collect reports and present
• Leadership
• Managing different Stakeholders

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Core Skills
A number of skills are beneficial for business analysts, but there are a handful of abilities that are absolutely necessary. This is a rundown of those fundamental skills:

Communicating:
Business analysts spend a significant amount of time interacting with clients, users, management, and developers. Therefore, being an effective communicator is key. You will be expected to facilitate work meetings, ask the right questions, and actively listen to your colleagues to take in new information and build relationships. A project’s success may revolve around your ability to communicate things like project requirements, changes, and testing results. In your interview, focus on your ability to communicate proficiently in person, on conference calls, in meetings both digitally and otherwise, and through email. Consider having an example ready that demonstrates how being an effective communicator has served former employers well.
Problem-Solving: Every project you work on is, at its core, developing a solution to a problem. Business analysts work to build a shared understanding of problems, outline the parameters of the project, and determine potential solutions.

Negotiating:
A business analyst is an intermediary between a variety of people with various types of personalities: clients, developers, users, management, and information technology (IT). You have to be able to achieve a profitable outcome for your company while finding a solution for the client that makes them happy. This balancing act demands the ability to influence a mutual solution and maintaining professional relationships.
Critical Thinking: Business analysts must assess multiple choices before leading the team toward a solution. Effectively doing so requires a critical review of data, documentation, user input surveys, and workflow. They ask probing questions until every issue is evaluated in its entirety to determine the best conflict resolution.
General Skills
Besides the core skills, employers also will be looking for more general
skills and attributes:

Personal Attributes:
Sought-after personal attributes include adaptability and the ability to work in a fast-paced environment with cross-functional teams. You also should hone analytical thinking, attention to detail, and creativity. Business analysts also are equipped with strong organizational skills, the ability to multitask and be an assertive, diplomatic leader.

Computer Skills:
As a business analyst, you’ll need to be able to use many types of software, from the popular Microsoft Office Suite to less common packages like SharePoint, Visio, and Software Design Tools. You will need to stay abreast of new developments in IT as well.
Analytical Skills: Of course, a business analyst needs analytical tools for the efficient designing and implementing of processes to forecasting and gap analysis.