There's never a field definite for any student. Though conventionally, people either go on to become doctors or researchers or sometimes they change their course to civil services as well but i would just prefer to say that never let the tag of a bio student define your life in stone. If you are truly invested in biology than research as well as you can.There are fields like microbiology, genetic engineering, etc. that might capture your attention.

1.These are just an outline of the opportunities but there still more other than MBBS.

2.Vertinary Sciences if you are an animal lover.

3.Paramedical courses like pharmacy, physiotherapy and so on if you are interested in medical field.

All the best!