What else could I be doing?

So me and my partner already have a nearly 3year old girl and I conceived the first time we slept together. We are ttc baby #2 and it feels like it's never going to happen again we have been trying for nearly a year and back in September I had a misscarriage at around 6weeks my periods went back to normal straight away and we started trying again as soon as my bleeding stopped but it's just constant bfn every month. I am just wondering what else I can do apart from the obvious more sex but I don't think we could possibly have anymore than we already do ha! I take folic acid every morning and I use Glow to track my fertile week but is there anything else I could possibly try that could help too as I am kinda new to the whole ttc as we never had that issue with our first?!