The I.R.S. specifically notes that there is no limit on overall deductions, and hasn't been for years. https://www.irs.gov/newsroom/irs-provides-tax-inflation-adju....

However, there are now limits on individual deductions that didn't previously exist, like the SALT cap of $10,000. It also appears you were affected by the cap on the (loan) value of homes which for which you could take the mortgage interest deduction, which was lowered to $750k from $1m by the TCJA (meaning, if your home is worth more than $750k for loan purposes you can only deduct the mortgage interest attributable to the first $750k of the loan), or by the elimination of a number of 2% items (items that pre-TCJA could be deducted only if they exceeded 2% of your AGI).