https://btc.com/stats/unconfirmed-tx

one input and one output is ~300 bytes or 250, no wallet to check atm. make sure you spend all 6 inputs, no change to another address!

combining 6 inputs to one output is 1800 bytes,

paying 20 satoshi per byte will get your transaction within 12 hours, that make 0,00036, out of 0,015 that's 2,4%
paying 40 satoshi per byte will drop the time to 3 hours and feee would be 0,00072 or 4,8%

you can drop those to 10 satoshi, they will confirm for a day, at most 2 days for 1,2%!

p.s. online wallets charge fee from 0,0001 to 0,001, if you can't do the math, they can and keep the change as a profit!

imagine 5000 miners store their 0,015 daily earn a total ot 75btc/+$300K on pool op's hot wallet!