Just to point out that a couple of those links are very much out of date. The Electrum one for example talks about checking the "Replaceable" box, where as Electrum has actually removed this option altogether now on the GUI and made all transactions opted in to RBF by default for some time now. achow101's post makes a distinction between making an opt-in and a full RBF transaction which is also fairly outdated since most good wallets have supported opt-in RBF for years and full RBF is becoming the standard.

Given the number of nodes and the amount of hashrate now supporting full RBF, then you can essentially now replace any transaction whether or not it is flagged as RBF, and so stuck transactions should be a thing of the past. If your wallet software does not let you do this, then switch to a better wallet.