Am I underpaid? as an Android developer with 4.5 years of experience.

I have over 4.5 years of experience as an Android developer and I earn close to 10LPA CTC fixed, no variable pay.

"Comparision is a thief of joy" but I'm jealous of my friends who are earning twice or thrice as well as getting other perks like foreign travel with their jobs.

I want to know if there is similar monetary growth in Android development compared to backend, devops, AI etc.
My manager said that there is no long term future in Android development, you will move to management after 8-10 years. He also said that Android developers are underpaid compared to some other tech jobs.

I have a few questions:
1) Jetpack compose or Flutter, where's the demand and future?
2) Kya android developers paisa kama rahe hai? T: Are android developers earning well?
3) What are people with similar experience in Android earning?
4) is there a guide which Lists all the topics of Android from basics to advance. Basically a table of contents with everything about android. I can use this to learn more. (except roadmap websites.)

Also I'm going to switch so any advice related to course, companies to apply, advice
is highly appreciated.

Thank you.