Bottoms-up Financial Modeling Help

Background: I do FP&A for a mid-stage tech startup. I have developed a complex, but sound, financial model forecasting revenues/cost of revenue from a bottoms-up approach for over 500 customers.

Problem: The model can get very confusing with all of its tabs (roughly 15) that pull data (to support the inputs/assumptions), inputs, and output calculations. With 500 accounts and so much data/inputs, the model can be exhausting to audit formulas that will include calculations and lookups from several different sheets at once. I am also worried about the ease of updating the model when new accounts are signed (thus increasing the line count) and when new months of 'actuals' are pulled in to update the assumptions/inputs.

Goal: I want to keep the high detail that I have in my current model but need it to be more smooth and preferably reduced to just a few sheets. I would love for my forecasts/output page to flow into something like this.

Any thoughts on my problem?