Next step to FAANG?

I’m working as salesforce developer and I have 4.5 years experience. I am confident that I can crack data structure and system design rounds. But I don’t know Java/ python/ SQL servers/ anything related to data and AI engineering now how will I be able to switch to FAANG companies?

There is openings for salesforce developer but the designation is application engineer and I believe the salary will be not competitive as SDE/ data engineer/ AI engineer roles. What should I do now?? Please help me