The eco modes aren't strictly necessary to extend range, though they can be handy if you're not the type to want to actively manage your driving style for efficiency. They effectively just throttle down your acceleration and your accessories like climate control.
Ive found the best range when driving smoothly and steadily, using D mode to coast around as much as possible, and then using the shifter to bump up the regenerative brake, then only touch the brake pedal when coming to a complete stop. I used to drive trains, so my driving style naturally has shifted to seeing the red light up ahead and just taking my foot off the gas real early, and rolling up to the stop smoothly. General rule is if I see the red light ahead, I probably dont need to touch the accelerator pedal at all.
Taking off smoothly, trying to keep the power meter under the 50% mark seems to work well. If its safe to do so, back off the accelerator when going up a hill; if you don't mind losing some mph on the uphill, but then regaining it on the downhill you'll see the impact of hilly roads lessened. Accelerating up a grade is probably the most energy intensive driving.
I'm not sure if this is your first EV, but one trap people sometimes fall into is overestimating the effect of the regenerative brake on battery level. As a rule, unless you need to use the brake to slow down, using regen will waste more battery than just coasting around, since there are efficiency losses during the regen. Try to think of regen brake strictly as a brake that just so happens to give you a bit of a boost. Regen then speeding up again will always cost more energy than just maintaining speed.
Try to keep as little 'stuff' in the car as possible, added weight will reduce range. Likewise, make sure your wheel alignment is good all the time. Misalignment will hurt your range too. Check your tyre pressure on the regular, too. Low pressure = low range.
A/C and Heating are obvious range killers, so try to use the pre-heat/pre-cool function through car-net while plugged in before driving on a hot or cold day.
If you're doing 70 on the freeway, consider dropping to 65 (if safe to do so). It will make a surprisingly big difference. Each 5mph above 70 seems to significantly reduce range. It feels like the sweet spot is about 55mph, maybe 60 to 65 on the 36kWh models. They seem to handle freeway speeds better than the 24kWh models.
If you really want to push the range, consider taking surface streets. Most of the time though, just drive it like a car and plug it in overnight and have a fresh battery every day
(For longevity, you may want to set the car to only charge to 80% by default. If you need a full charge you can press the "Charge now" button and have it go to 100)