in order to perform an RBF you need to first tell the network you are going to do it. it is like a flag on your transaction that says "i may change the fee in my transaction in the future, keep a look out". and your transction doesn't have this "flag". you can see it below. your sequences (ffffffff) are all max value instead of being lower.
Quote
0100000003587bd15b7b11c0d6112dc11a1e7bb99c068472d075c24f4f060a92121ad6ea2a00000 0006a47304402203d804ac55e0fa5588a27c7c3e0db7eb961b101c3a3f969f4735eb7a5aa265a1a 0220338a5155abc27878ed1fd184c582325e4c7d67c34f25c34b71f26325b6f4952f01210278fa6 4897dfed00af41adeea99a38397b0bdb344d978d7b6e216e574bb5ceef3ffffffffac802a84b157d4551024383c57744d73f23469b92c51d5dac7a60de6c50541a8000000006a47304 402203626455580ca76a50b67bb0c8ffb2852e6b4457cfaac8c72b694261afe6e72d502201cde71 0a93253fa35b9d50aea62263c24f4ea741ada704ef6f668a2603d7534c01210278fa64897dfed00 af41adeea99a38397b0bdb344d978d7b6e216e574bb5ceef3ffffffff863d9becf618ec69edec5fca4124877664734cb2e67d15d177b049a979ce56d4010000006b48304 5022100d29abd969a26683a13ad2ab0ebedac3d5c1318a1cd15cd04f673111f744cf8a802201e6a 4b8272f9a87957489e33438652dcb0afbd248b2803548f438b5ad3b8bae101210278fa64897dfed 00af41adeea99a38397b0bdb344d978d7b6e216e574bb5ceef3ffffffff01906d1800000000001976a914ae895ab95dbe0bbc95bc3bea1c87cd7790c034ec88ac00000000
