My approach has been :
- do not fully charge unless it is needed (which isn't often in a Bolt, unless you have a 200+ mile commute) ; I would charge to about 80% (either manually stopping the charge, OR setting the timer to start charge so that it would be about 70% when I got up). It wasn't that difficult for me, as I rarely drive more than 30 miles a day, so plugging in for 90 minutes or 2 hours got me back to 70-80%.
- when you do charge to 100%, don't let the car sit for a long time at full charge. I would set the charge timer so that it would reach 100% about an hour or 90 minutes before my departure.
- do not charge when the battery is hot - heat kills Li-Ion batteries. Repeated hot charges (and discharges) are bad, bad, bad. I used to even wait an hour or two before plugging the car in to charge after I got home, and wait to charge late at night after the temp had dropped on really hot days - OR, plug in the 120V OEM EVSE on really hot days, so that the car would run it's battery temp mgmt system to keep the battery cooler while still not putting in juice at a fast rate - then plug the car into 240V late at night, or even skip it for a day.
- do not park in full sun for long periods (like when at work) on HOT days (over 85 or 90). The battery will get heated up over the hours that you are at work. I have a friend who talked his employer into letting him install one of those canvas-and-aluminum portable car-ports at the back of the parking lot (with a reserved for <license plate> sign) so that his EV was always in the shade. He'd put it up around June and take it down in early October.
- rarely DCFC (only when needed). DCFC heats up the battery cells. The faster you charge, the more heat accumulates in the battery, especially as you reach 80% or higher. (It also depends on how much you put in - charging from 10% to 80% will generate a lot more heat than charging from 55% to 80%.)
- let the car charge to 100% about once every 4-6 weeks to let the battery do cell balancing, if needed.
So I wasn't a maniac about it - if I needed it, I did it. If I forgot and occasionally charged to 100%, no biggie. I was just trying to set my *default* mode to protect the battery as much as possible. I figured that if I did a full charge (maybe) 2 or 3 times a month, instead of every night, that I was prolonging the life of my battery. And they are easy habits to get into - I actually bought a super-cheap kitchen timer that I always had set to 60 minutes and I stuck in to my fridge door, which I would turn on when I got home (unless I forgot - then I'd see it when I got food out of the fridge, and remember to charge anyways). When it went off, I'd hook the car up to charge.
Now some of these are "extreme" - but only in the sense that they might not be needed, so they are a 'waste of time'. But my outlook was that they are really easy to make 'the default', they don't take up much time, and just the *chance* that these actions might increase the battery life (and range) was enough for me to add an extra 30 seconds a day into my routine. Again, I didn't obsess about them, I just tried to do them most of the time.