For example, if you have 70 UTXOs in total, then each utxo takes about 200 or so (v)bytes in the transaction, so 70 * 200 = at least 14000 sats transaction if not more.
The v(size) of data added to a transaction for each input is usually much smaller.
Even if you add a legacy input to your transaction, it adds around 140 vbytes to transaction size. Each native segwit input adds around 68 vbytes and each nested input adds around 93 vbytes to transaction size.
Which means for 70 inputs and 1 output for legacy addresses, it has 10404 vbytes
Which means for 70 inputs and 1 output for segwit version 0 addresses, it has 4802 vbytes
Which means for 70 inputs and 1 output for segwit version 1 (P2TR) addresses, it has 4079 vbytes
The fee will be much lower for segwit addresses.