The more congested the network, the more fees you pay. Therefore, you must choose the appropriate times if you want to pay less fees.
Don't make the network more crowded, use https://jochen-hoenicke.de/queue to find out the right fees and use this opportunity to get fast confirmations and small fees.
Problem with this thinking is that, when you want to send transaction you don't wait days/weeks/months to pay less fee. You need to send it so you pay as much as is currently required for transaction to get through. Don't make the network more crowded, use https://jochen-hoenicke.de/queue to find out the right fees and use this opportunity to get fast confirmations and small fees.
Would you wait to send BTC for your coffee? you can't
Would you wait to send BTC for your bills? you can't
Would you wait to send BTC to your family? you can't
Lets say you can wait in 5 of 100 examples, so good advice but not possible to use in real world.