Upper abdomen discomfort. It might be?

I have been experiencing a persistent dull discomfort on the left side of my upper abdomen, just below the ribs, since around early September. The pain is not sharp, but feels like a constant pressure or heaviness, as if something is inside on that side. The discomfort becomes more noticeable when I sit for a long time, bend forward, or stay in one posture. Doctor suspected Costochondritis and Gilbert’s syndrome. Investigations: • USG Abdomen: Liver mildly enlarged (15.3 cm); early fatty change in pancreas • LFT: SGOT 21.8, SGPT 23.1 (normal) • Bilirubin: Total 2.1 (Direct 0.37, Indirect 1.73) • Amylase/Lipase: Normal • Lipid Profile: TC 182, LDL 116.9 (mild ↑), HDL 45 • TSH: 5.89 (mild ↑) • Vitamin D: 19 ng/ml (low) • HbA1c: 4.9% • Kidney, CBC, Urine: Normal Alcohol: Occasional(monthly now once/twice or even no) Smoking: occasional Current meds: Shelcal HD, Lumia 60K, Evion Suggest what more to do now and what it might be?