thank for the detailed explanation. I will go to take a look at the RBF feature
To use RBF feature, your transaction must be RBF opt-in.
Did you broadcast your transaction initially with RBF opt-in? If wallet you use has an opt-in RBF, your transaction will have it with default setting.
If you are unsure, you can copy and paste your transaction id to
https://blockchair.com/bitcoin and click on Additional information and see at a row for
RBF EnabledIf your transaction is RBF opt-in, it will show as Yes.