The question is not whether Excel is good or bad. The question is whether your current way of working can support the volume, speed, permissions and traceability your business now needs.
Signal 1: every team has a different version
Sales, warehouse, purchasing and finance work from files that do not match. Every close requires reconciliation and a judgment about which version seems correct.
What an ERP changes
Signal 2: the team works to prepare information
If people spend hours copying, correcting and consolidating, the company is paying for missing integration with time that could be used to analyze and serve customers.
What to automate first
Signal 3: growth increases risk
More branches, products, users, channels or transactions require controls that do not depend on one person remembering how every file works.
A gradual migration
Conclusion
You do not need to change everything at once. You need to know which process requires a trusted source, a clear rule and an owner. Grupo GDS can help you define that first boundary.