I knew the basics, and at a first look it does look correct.
I knew you know that.
I made that post for OP or anyone else who want to do such a calculation.
Still, I am not convinced that everybody knows where to look for those "numbers" (and I'm not talking about you or me).
You are right. For a newbie, it may be difficult to know what are fee rate and transaction size.
What site is this?
The screesnshot posted by Peanutswar has been taken from
mempool.space.
It's a block explorer and can be used for tracking transactions.
You didn't tell us whether you have control over any of receiving addresses or not.
If so, as suggested by NeuroticFish, you can use CPFP method.
I didn't know how to calculate that correct cpfp fee however if you take a look at my receiving address of the tx I did try sending multiple txs with higher fees but no luck!