We bought licences and the team went back to Excel
A capable platform, properly paid for, and a sales team maintaining their own sheets alongside it. Usually the CRM demands fields the team cannot fill at the point of entry, or takes eleven clicks to log something that takes one line in a spreadsheet.
Start from the data entry moment rather than the reporting screen. Make capture faster than the spreadsheet — fewer mandatory fields, sensible defaults, mobile entry, WhatsApp and call logs flowing in automatically — and the sheet stops being worth maintaining.
If adoption failed once, there is scepticism to overcome as well as software to build. That is a change management job and it needs time in the plan.

