As youth living in the West, what’s the best of advice you could give us to prepare for the reappearance of Imam Mahdi AJTFS so that we are able to always serve him?

You can listen to my recent majlis of Muharram you will find ways.
In short whatever ur profession is try to be perfect in your field, enhance your abilities, be a specialist of your profession and do Niyyat that all you doing for Imam e Zaman ajtf. Work on your soul, while reading Quran and munajaat