what can i do for weak bladder muscles

I am a 38 yr old who has a problem with leaking urine mildly

Do pelvic muscle exercises such as kegel exercises which strengthen pelvic floor muscles and sphincter muscles which can reduce or cure stress leakage. Sit on a hard chair; lean forward and tighten all your sphincter muscles, anal, vaginal, and urethral, in succession, front to back; hold the squeeze for one or two seconds; release, then contract from back to front.
Also reduce intake of coffee, tea, and alcohol.