Can we make dua to ask for the highest point in Jannah (heaven)?
This question could be surveyed from two different aspects:
As the initial aspect it would be said that solely praying (dua) for the highest point in Jannah won’t be sufficient. Since you should have good deed to be hopeful that Allah takes you to the highest points… otherwise as a rational rule, Allah won’t give us high point without having good deeds (just to say it by our tongues...)
On the other aspect, we should be hopeful regarding the promotion of our high-point, since Allah has declared in the Holy Qur'an that “Call upon Me; I will respond to you”, consequently it indicates that pray (dua) would be effective in granting the desires and needs that Allah himself mentioned it. Anyhow we should be hopeful about anything along with having good deeds.
Look at the following verse of the Holy Quran which could be related to your inquiry.
وَقَالَ رَبُّكُمُ ادْعُونِي أَسْتَجِبْ لَكُمْ ۚ إِنَّ الَّذِينَ يَسْتَكْبِرُونَ عَنْ عِبَادَتِي سَيَدْخُلُونَ جَهَنَّمَ دَاخِرِينَ ﴿٦٠
And your Lord says, "Call upon Me; I will respond to you." Indeed, those who disdain My worship will enter Hell [rendered] contemptible. (60)
yes but if you are looking for higher places you should doing some "niko"("اعمال صالح")(god things )there was group in imam ali age and they just pray an stick into mountains and..(they called soofi) and one day imam ali told that way is not true. Islam needs doing good things like charity and some times defending against enemys and..