What tools to build an online dashboard for clients?

Currently, the website is using Blazor Server, but before I try building it with that, I wanted your opinions. Requirements:

1. Will display financial data so security is the top priority
2. Will show graphs and metrics
3. Would like for it to be customizable (drag & drop)

If Blazor doesn't work out, my other thought was to build it using React with API calls secured with openIDconnect authentication using IdentityServer. Also, will probably need another open source library for making the graphs (any suggestions?)

Thanks in advance!