@Chanur
Are you music sources and EQ/processor of high enough quality?
For me after many years, what made my headphones (and I have way to many to list) much better, almost every model I tried were these things
a) found music that was recorded well, it was not the bit rate (that I was thinking all these years) -- but the quality of recording. And then anything of 192Kbps was fine.
b) I stopped using VLC music player on my android phones -- and paid for Neutron and USB Audo player Pro ( I like Neutron more for a bunch of reasons..)
c) learned (well still learning) how to use parametric EQ in Neutron
These music players auto-detec my phones' internal DAC and overall with the above 3, I made my most of existing headphones sound different and better.
I do think you should have closed back headphones in your collection

. For me, I very much enjoy used Audio Technica ATH-A 900x and ATH-A 990z.
I think Denon 5200 can be the 'end game' so to speak for closed back if you want to get to that price range. But again I really like the Audio Technica models. You can also check their outlet store
https://outlet.audio-technica.com/
the Axx models are closed-back the ADxx are open back. The Rxx models are open back.
I would also check the inexpensive JVC HA-RX 700
https://www.jvc.com/usa/headphones/wired-headband/ha-rx700/
(ebay prices may have them in $25 range).
The JVC and A9x series use the same diameter 110mm pads, and I was able to get incredible sound (in my mind) and variations (as if I was buying different headphones) just by playing with different pads for the above models.
Velour pads is what I typically start with if I want to improve mids or highs, and protein leather or real leather if I want to get more bass (although I cannot really confirm that this is a 'formula' wrth pads material)