Should I go for it? Or something else?

5 years ago I went to school for medical billing! The prerequisites were hell! But when I finally got to the medical billing courses I noticed quickly that the teachers weren’t teaching us everything we needed to know or wasn’t putting their all into teaching. My last quarter I found out I was pregnant and thankfully I passed my last semester I don’t know how but I did it! Once I got my certificate I just focused on working at my job and getting ready for my daughter’s arrival. I never really applied for medical billing jobs until now 5yrs later I remember some things but not all that I should know! I really want to put my certificate to use and find a job in medical billing but isn’t having any look due to no experience! So should I just give up and go back to school for something different? Or keep pushing forward and find a job in medical billing?