TTC advice

I’ve been TTC for about 4 months now, and although that may not seem long, I’m definitely getting discouraged! I already have a toddler and it took about 2 or 3 cycles to get pregnant with him. And right before him, I had a miscarriage. I’m at the point where I wish I would just get pregnant really quickly so I’d have a baby close in age to their sibling, but at this point they would be 2 and a half or 3 years apart.. maybe more if I don’t get pregnant soon. (which I know isn’t that much but I wanted an age gap of 2 years max). How long did it take you to conceive and any advice? Maybe a diet change? And advice or recommendations are appreciated!