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It is not easy to refresh the IMPORTHTML functions in Google Sheets due to cashe limitations. The resulting limitations are old data instead of new data being pulled into the Sheet upon running a Script to reload the IMPORTHTML function. This Google Script is a "Cache-Busting" function which circumvents this problem.
// Set your variables below
SHEET_NAME="MC-Import-Data"
URL="https://coinmarketcap.com/currencies/views/all/"

// Create a trigger to refresh every 5 minutes
function myFunctionA() {
  ScriptApp.newTrigger("getData")
  .timeBased()
  .everyMinutes(5)
  .create();
}

// Create a trigger to refresh every time the sheet is reopened 
function myFunctionB() {
  ScriptApp.newTrigger("getData")
  .fromSpreadsheet()
  .open()
  .create();
}

// Compile your variable URL with an appended data-time stamp
function getData() {
  SpreadsheetApp
  .getActiveSpreadsheet()
  .getSheetByName(SHEET_NAME)
  .getRange("A1")
  .setValue( URL + "?" + Utilities.formatDate(new Date(), "GMT", "yyyyMMddHHmmss") );
}

// Upon completion, you will get an updating URL in A1 of the sheet you specified in the URL= variable
// Be sure to open your sheet and use the updating URL to build your IMPORTHTML formula
// Example: =IMPORTHTML(A1,"TABLE")
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