Seems like I’ll never get pregnant again .. :(

I keep trying and trying . I had my first child 15 years ago. Now I’m 34 and want another so bad. I been trying for the past 3 years... and kinda gave up trying and let nature take its course.. seems like I’ll never get pregnant again I don’t know what I’m doing wrong :( I’ve tried the preseed lube... tired ovulation predictors... ;(