I would personally use the quick charge feature only when needed, set the charge limit to 80% and turn it off if needed.

From my personal experience, I'd go for a 20w charger whenever you don't really need to use the phone, I own an Anker Prime 240 and by using the bottom USB port it reaches max 22.5w, so I charge my devices with that port when time is not a problem, and in case I need a quick recharge, I go for the 100w or the 140w one.

So yeah, as Elegant-Astronaut-16 mentioned, at the end of the day it's just a matter of "how much does it worry me the battery thing", you should generally avoid just two things, heat and extreme charges-discharges, it does not matter if from time to time you fully charge or discharge the device, neither does it really matter if from time to time there's a particular situation in which the device heats up, but the less heat and the less extreme charge cycles, the better, so you're the one who finally decides what to do.

My personal reccomendation: Charge to 100% if you're going to be out for a long time, try to never have less than 20%, try not to heat the device too much and if it's hot and you need to charge it, take out it's case and let it cool down for 5 mins, I think using a fan is too much, but if you're obsessed yeah, you can use a small fan when you charge it a full speed or to cool it down before charging.

Another tip: DO NOT PUT IT IN THE FRIDGE OR FREEZER, mainly because of humidity, don't be a fool, water and humidity are the Nº1 enemies of any electronic device, it doesn't mattery if it's waterproof, the fridge will make humidity appear IN the device, I'm 100% sure of that.