Yes, tabs are a great idea, Scan My Tesla used them since ~2016. But they eat a lot of the screen, and with more than 3 or so you have to start scrolling them sideways. If you turn to landscape mode, they are taking up something like 15-20% of your screen height, and you almost never use them, but they constantly take up a large portion of the screen. This is why I tried to think differently this time.
The original idea was to auto-hide the whole hamburger menu including the buttons, so that after say 30 seconds or one minute it would disappear and give you the whole screen for gauges. But realized if you were in the middle of customizing or reading the buttons, an auto-hide would be super annoying. Still pondering how to do this right.
I still think it's better than tabs, some adjustments are needed to make it more intuitive for new users. I am still trying to figure out what new Android and IOS apps use as design language for a pulldown menu, but I suspect we are both barking up the wrong tree, phones don't use pulldown menus, only Windows and PC OS do that. I think.
What I always wanted to add to the Android tab interface, that wasn't possible (with the UI framework I used), was a side-swipe on the signal part to get to the next or previous tab. Maybe we can make that happen here, so that even if the whole hamburger is closed, you can still quickly swipe from side to side to get across the different 'lists'. That is another challenge to make work, and more so a challenge to make it intuitive.
We can also imagine that even if you didn't get that it was a pulldown on the first run of the app, if I had a 'tutorial' popup, such arrows as you already drew, pop up on the first run, you would learn where to click and how to use it right away. This was my idea behind the 'welcome pages', but it didn't turn out as nice as I imagined it, and it's already vastly outdated in comparison to what the app is today.
I should, probably a long time ago, hire help from some real UX designers/implementers. I am using C#/Xamarin.Forms, feel free to PM me if you are out there and think you can help.