How to beautify one's voice while reciting quran...after applying all tajweed rules?

As salaamu alaykum

How to beautify one's voice while reciting quran...after applying all tajweed rules?

Wa alaikum assalaam wa rahmatullahi wa barakatuh,
One should use their natural voice and let it come out as it does without spending an over amount of time in beautifying it.  Everyone has a beauty in their voice and the best sound is the natural beauty. 
Some force beautification in Qur'an reading and while doing that change rules and lengthen sounds which should not be over lengthened, even sometimes it sounds more like a song that the recitation of our Holy Book.  We should take care that the sound of our recitation is not overdone so we concentrate on the sound more than the meaning and the tajweed rule application. 
Please see the following link:

Here is a quote from within the answer in the above link:

Dr. Sheikh Ayman Swayd, may Allah preserve him, wrote a small book entitled “Al-Bayaan lihukm qira’at al-Qur’an Al-Kareem bil-Alhaan”, meaning “The Clear statement on the ruling of reading the Qur’an with melodies”. In this small book, which is quite thorough, on page 44-45 , we have his concluding statements [translated and condensed]:

1. Reciting the Glorious Qur’an with tunes and musical melodies is bid’a, it was not by the Messenger of Allah, , nor the honorable companions, nor did Jibreel bring the revelations with them. 

2. Beautifying the voice when reciting the Glorious Qur’an is a matter that is praiseworthy and desired in Sharee’ah, but that should be in with ones natural recitation and with natural Arabic tones, not with the foreign tones.

3. If one reads the Qur’an with a specific melody of musical melodies or tunes then the matter falls into one of two categories:
If he/she gives the tilaawah rules preference and focuses on them more than the musical tune, then the ruling is one of detest (karaahah), since this is not from the Prophet.
If he/she focuses on the musical tune more than the tajweed rules, then the scholars are in agreement that this form of reading the Qur’an is haraam and it is haraam to listen to it also.