but I didn’t find a wallet with lower fees.
Wallets don't have fees. Transactions have fees. You should find a wallet which lets you pick your own fee, and doesn't dictate a fee to you.
for instance your freebitco.in account takes a slightly smaller fee compared to a transaction's fee because they are paying a lot of users at once in one transaction which would decrease the size by a little bit so it decreases the total fee they have to pay compared to if they created individual transactions for each user.
I'm not sure I follow you here. What do you mean they take a "slightly smaller fee compared to a transaction's fee"? They are charging 1772 sat for a withdrawal in 6 hours. Given that even without batching a withdrawal would be a simple 1-input 2-output transaction of around 220 bytes, 220 sat would probably be enough to confirm within 6 hours. Almost all centralized services overcharge for withdrawals because they have to cover the costs of consolidation transactions which happen in the background, as well as take a bit of profit.