Fertility lubricants

I know this might sound weird but me and my husband have been trying for a few months with our second baby and I have been using opk tests so we know when to baby dance on high and peak fertility days. This is the third month with no luck conceiving. I feel like part of the problem might be that I don’t have enough cervical mucus that you’re supposed to have during your fertile window. Is there a lubricant you recommend that helps sperm have better motility?