Career advice, help me out

I am 2025 graduate. My primary interest is in backend. I have done 2 interns till date one was in front end and another was fullstack(more backend oriented). 2nd was startup(pays well, would be around 13 LPA) but didn't got PPO. I joined another startup now. They are giving sureity of full time after my college ends, and will pay 8-9 LPA. It is also fullstack but they are giving me frontend tasks only. I want to switch and also go to more high paying and wants to pursue backend. Please suggest something.

PS:- I am also thinking I am earning less. I am from Tier 2 engineering college