Need Advice on Selecting Methodology For New Project

I own a business that sells a software product that was developed in Visual FoxPro (yeah I know…). Anyway, time has come to modernize this application (think of it as a client management database + loan servicing software + construction project management application). The client management part is just collecting data with some rudimentary calculations. The loan service piece is the most complicated and then the construction project management part is not as complicated as loan servicing. The key piece is that this needs to be a multi-tenant application accessible via the web and each client (tenant) needs to obviously only be able to see their data!

I've been recommended to look at Java or Node for the backend, and react/redux for the front end but wanted to throw this out to the reddit community of experts to see what you guys think.

I need to do this on the lower end of the cost spectrum which is why I am hesitant to look at ASP.NET but if that's the platform to go with, then so be it.

What do you guys think?