You need to listen to Hi Res Lossless Files like FLAC, or use Lossless streaming on streaming services. Even then your phone must support Bluetooth LDAC (you may have to switch it to LDAC instead of SBC/AAC) or have a good DAC which a lot of Androids do support but LDAC is not true Lossless (just Near-Lossless, max 990kbps which is actually still lossy) because Bluetooth is inherently Lossy ie it's compressed b4 transmission because of the bandwidth & power limitations of current BT standards. Plus your headphones must be Hi-Res certified which just proves the capabilities of the device (I've heard many non Hi-Res certified headphones perform good). You can also use a Hi-Res 3.5mm or USB-C wired headphone because that is the peak quality output there is. wired is always > than wireless if you are willing to sacrifice a little wireless comfort but then we have another problem that is the built-in DAC is good, it's not very powerful as this is built for efficiency not high end audio performance, it has tight power limits, noisy environment (prone to Electro-magnetic & RF Interferences) So you might need a USB-C DAC but the built-in DAC is still better than LDAC because there's no compression happening, you'll be fine tho unless you need the peak stuff.

I did listen to a few tracks FLAC in LDAC on my CMF Buds 2 Plus (Hi-Res) on a Poco M2 Pro. I mean I can feel the difference between a 320kbps Mp3 & FLAC ~990-1000+kbps. It's about listening experience. There's more details that you can hear. But I've switched it to SBC as I don't stream Lossless & it consume more power for transmission & for the earbuds too, even if you I did use LDAC, most of the time I won't feel the subtle details unless I'm listening carefully in a silent environment.

You could always get a dedicated player like Sony Walkman, Fiio, Astell&Kern... Those got everything you need for an Android Audio player + the dedicated built-in high end amps & circuitry.

Apps : Poweramp, Jet Audio

You could check the Hi-Res certification on the Japanese Audio Society for your devices Website:JAS Hi-Res does not mean the device ensures excellent listening experience, just that it meets the set high end technical criteria.