How can a Muslim enter the highest Paradise (Jannat al-Firdaws), and is there a better means than it?

"Al-Waseelah" is the highest degree in Paradise, attained by only one of Allah's servants. It has been reported from the Prophet, peace and blessings be upon him, that he said: "Ask for Al-Waseelah for me, for it is a station in Paradise that is not befitting except for one of Allah's servants, and I hope that I am he. Whoever asks Al-Waseelah for me, intercession becomes permissible for him." The Prophet commanded his nation to ask for it for him, so that through this supplication, they might attain closeness to Allah and an increase in faith.