How to take good pictures indoors with OM Systems TG-7?

Two years ago I bought a new OM Systems TG-7 camera. I was very excited as it looked nice and had certain new features like registering GPS positions, and it's possible to charge the battery without removing it from the camera. I had, happily, used an Olympus [greek letter mu] 1050 SW for 15 years and decided to finally splurge on a replacement. At first I wanted a new Olympus, but I realised that they for some reason had changed the brand name.

But I'm seemingly not able to take good photographs indoors. Weirdly, the "Auto" position does not have a "flash on" setting, only "auto" and "off". The altitude meter is severely unreliable. I calibrate it to 16 m. amsl.; a few hours later it might say 186 m. - in the same room!

I returned the new camera to the seller twice, but they wouldn't take it back. So I made a complaint to my credit card provider and had my money reimbursed. I've continued to use it but I'm still far from satisfied with the results.

In fact, I had to purchase two new batteries at that time (July 2024) for my old camera, which I've continued to use indoors. Now one of those two new batteries is about to get useless - it runs out after just ten or so snaps with the flash on.

I keep taking several photograps every single day, both in- and outdoors, and it really grinds my gears that other people - who I suppose in general are way less interested and experienced than me when it comes to photography - manages to take better photograps with mobile phone cameras than I do with dedicated cameras.

Carrying two cameras (that doesn't even use the same batteries, chargers and transfer cables) around is more than a bit impractical. I purchased my wristwatch four years ago and it hasn't started to function properly yet - it keeps losing time. At the moment it runs 29 seconds late - last corrected at the start of DST. So I have to use my computer to check what the time actually is every time I change the battery in my old camera (there's no "cold swapping"). So at least once a day.

Any advice?