I'm in the same boat with the 2012 MbPRo, I upgraded it to SSD and its pretty fast.. 2.7 quad I7Love my iPhone X. I can handle the price tag for that, but damn the MBPs are steep. I need to replace my 2012 cMBP too.
They are so pricy. May have to just settle for a new iMac.
I think if I needed something faster I might try the Old 2010 or 2012 mac Pros..
They have them on eBay..12 core 3.46..for around $1500 worth trying out before paying $3-4 K for something else?
I like my 32" screen so I have to go headless. Happy New Year!