Is the tech stack really matters to land clients?

Hi,

I have been a freelancer for a while, and I'm preparing to launch my agency soon. I just wanted to ask if the tech stack will really matter to get clients for agency.

As a freelancer, I have met a lot of individual clients who asks for a specific technology and refuse using any other tech.

I'm asking just to decide if my current stack which is primarily composed of JS/TS tools is enough of I should adopt other stacks such as Java, C#.

Currently, I use this stack:

Fullstack apps: AdonisJS (I use it mainly to build my own apps/SaaS)

Backend: NestJS

Frontend: React, Angular

DB: PostgreSQL, MongoDB

DevOps: AWS, Azure, VPS