Customer Lifetime Value (CLV) = could be valued at spreadsheet at the start
For remaining:
Customer Acquisition Cost (CAC)
Net Promoter Score (NPS)
The Sean Ellis Test
I think you need to think about what values you need to calculate these metrics. Suppose you can’t get them out from Sharetribe, Stripe or GA dashboards then there always an option to get them with some custom code. The question here would be what would it take and if it is possible through the customer script or requires customizations in the code.
I think the main focus here would need to be - how much I can do with actual data and spreadsheet before jumping in customization.