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InfluxDB
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If somebody already ported something like LineageOS to your device you could look for the firmware in where the port was posted on, say, XDA Developers. That's how I found vendor files (or basically what is essentially firmware) for my A21s. That being said, even if you find the vendor files porting something like PostmarketOS to a new platform requires skill and some very specific knowledge about Android phones. I tried to compile Lineage myself using the vendor files and the Samsung kernel (which you can find on opensource.samsung.com for your model), but failed miserably to the point where I had to reflash my bootloader just to make things work again. If you do take up on that task, I wish you luck in your endeavors.
Poco F1 is also a pretty good option. I'm not sure how much a used one will cost but it was 350€ when it were sold. It supports Ubuntu Touch, Droidian, postmarketOS and Arch Linux. There may be some others that I didn't include too.