Can you tell us what specifically about Excel is causing you problems? Planning?
Analytics? File size? Too long to calculate growing files? If you are facing scaling problems, you should look into SaaS solutions. If you want quick deployment, a smaller, earlier stage SaaS company might give you more flexibility. Or if you are okay with slower deployment, more traditional / established SaaS platform might be the way to go. Happy to recommend a few solution providers depending on your needs. Many newer SaaS companies these days integrates well with Excel these days so you might be leverage a combination of Excel and these new SaaS solutions. Worst case, you can use a service like Zapier or Workato to integrate your Excel with another service using API calls.