While I'm far from top, I think at your early stages, many of the steps are pretty obvious:
- Read the LOTG (and all that other stuff in the book). Re-read it. Re-read it.
- You're on the right track hanging out here--you'll get a lot of good advice (along with a dose of bad advice--you'll sort that out over time)
- Do as many games, at various levels, as you can--as you can means that you you have the mental and physical stamina to do them well. going through the motions exhausted just helps create bad habitss.
- Keep a journal--after every game write down at least one thing you learned or wished you had done differently or didn't know how to handle
- Look for opportunities to be an AR. (I know that is very different where you are than when I am.) Being an AR will expose you to working with more experienced refs and the teamwork aspect that is critical as you progress.
- Watch referees at games one level above what you are doing. (Watching the pros is great, but those games can be so far removed that they often aren't as practical for growth).
- Find a mentor. On line is great, but you want someone you can talk to, maybe ref with sometimes, watch you sometimes, etc. Someone who also knows the local systems and can help you navigate.
- Read some of the good books from refs. The best one I know is The Art of Refereeing by Robert Evans and Edward Ballion, but it can be hard to find.
- Play, too. Even playing pick up games is going to give you a different feel for the game and help you better understand what players are trying to do. That will help you read the game better and anticipate what is happening. (This isn't absolutely essential, but I think it can be very helpful.)
- Be in condition and take care of your body. At the highest levels, refs really are professional athletes--they have to be able to run with elite athletes for 90 minutes and still be in top mental condition--exhaustion is a big enemy of decision making.