High preset is often a good starting place. Low usually sacrifices too much image quality, depending upon the game Medium settings can also be good. Texture quality should probably stay at high at 1440p unless you are VRAM limited. As stated above, shadows can often be turned down to medium as can cloud quality.
I personally disable motion blur, chromatic abberation and film grain on all games which can save 1-2 fps altogether.
Since you have a 2060, the best thing to do would be to use DLSS quality setting at 1440p, which will use a 1080p image and add some antialiasing and AI magic to make the 1440p image sometimes look better than native, all for close to 1080p performance.
In the Nvidia Control Panel you could choose all the performance settings for texture filtering and anisotrophic optimisations. Choosing prefer maximum performance over balanced power mode is debatable, as it might offer more perfomance but could just stop your GPU from cooling down when the load is low and thus making performance worse over longer play sessions.
You should 100% NOT be running any raytracing effects on a 20 series under a 2080 as you already mentioned in your post.
Is your new monitor G-sync compatible? If so, what refresh rate does it have? You might not need such a high framerate if you have G-sync enabled. Otherwise you might need to reduce settings until you can get a stable framerate above 60 to run with V-sync (ideally triplebuffered) on in order to avoid screen tearing.
