If I were starting from zero and wanted a dashboard that is both useful and not overwhelming I would focus on three buckets

Price and liquidity
On chain macro structure
Market positioning and froth

For price and liquidity you really only need a few things
Spot price per exchange
Aggregate volume
Order book depth and spread
Basic volatility metrics

If your dashboard can clearly show where real spot liquidity is and how it changes around big moves you already deliver more signal than most noisy platforms

For on chain macro structure this is where Bitcoin actually shines because the data is transparent
Realized price and market cap versus realized cap
MVRV or some simple realized value multiple
Hodl waves or a stripped down long term holder short term holder supply view
Fees versus block subsidy share and mempool congestion as a proxy for actual economic use