Here’re some accessible jazz musicians to try. I suggest "accessible" because you can more easily discern and learn to appreciate theme and variation which, as described above, is central to jazz. None of my suggestions are Big Band, Avant Garde, raucous, cacophonic, etc. You can find more music by any of the musicians I mention simply by going to Wikipedia and searching. For each artist, there should be a "Discography" section that describes each disc. WARNNG: I looked at this list after drafting it and realize it’s a little top-heavy with Charlie Haden:
1. Solo piano/piano with one other instrument: Fred Hersch (he also has trio recordings), but look for his solo recordings (e.g., "Solo" from 2020); Marcus Roberts (e.g., "Alone with Three Giants"); Keith Jarrett (many, but try "Last Dance" with bassist Charlie Haden); Hank Jones (his solo recordings and especially is albums with bassist Charlie Haden, "Steal Away" and "Come Sunday"; Bill Evans ("Alone" or his other solo works); Scott Joplin’s music played on solo piano (e.g., Marvin Hamlisch’s playing for "The Sting"; Thelonious Monk "Solo Monk."
2. Solos or two instruments or trios: The bassist Charlie Haden had several -- in addition to the ones I mentioned above, try "Beyond the Missouri Sky" with guitarist Pat Metheny and "Charlie Haden/Jim Hall."; Bill Evans’ "Live at Village Vanguard".
3. New Orleans, i.e., Dixieland music: Evan Christopher’s "Clarinet Road" (there are 3 volumes) and "Delta Bound";
4. Quartets and larger: "Silence" by Charlie Haden and Chet Baker; "Kind of Blue" by Miles David (don’t try this one first); Ben Webster ("King of the Tenors"; "Soulville"; "Jazz Round Midnight");
I could go on and on and even find some recs without Charlie Haden (!), but I’ll stop for now and let some more knowledgeable folks take over. And there are some great suggestions, above. Good luck!