Are there any seforim that give practical advice as to how one can reach the point to have giluy eliyahu hanavi?
I've heard some before but I don't remember.
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From the perspective of the middos tovos that one must have in order to see Eliyahu ha'navi:
According to a mekubal I once knew, Eliyahu Ha'navi appears to everyone at least once in their lifetime. Some people know when this happens, others don't.
Therefore it would appear that it may be possible to rephrase your question as: Is there a formula for determining when Eliyahu appears to me?
I heard my favourite story on this topic from Rb Fishel Shachter, I am sure it is a common story, said in various different versions.
The story is about someone who prepared themselves for a month through ta'aneisim and siguphim for giluy Eliyahu. He then sat down to learn, waiting for Eliyahu. At the moment, the local drunk importunely knocked on this door, as he was out of liquor. After shooing him away, the tzadik sat down and waited for Eliyahu, who failed to appear.
He complained to his rebbe that Eliyahu had not appeared, the response was predictable, the drunk was Eliyahu Ha'navi.
The lesson of this mashal appears to be as follows:
If we accept EVERYONE, without exception and without looking askance at them, then we stand a chance of knowing when we see Eliyahu Ha'navi. However, if we only look towards and accept the "important people," then Eliyahu says to us, "I'm not important either you know. So you'd better pass me by..."
(The closest source in Chazal I can think of for this approach is
נזדמן לו אדם אחד שהוא מכוער ביותר - במסכת דרך ארץ מפרש דאותו אדם היינו אליהו ולטוב נתכוין כדי שלא ירגיל בדבר. )
From the perspective of the spiritual growth that one must have in order to see Eliyahu ha'navi: The passuk says
וַיְהִי הֵמָּה הֹלְכִים הָלוֹךְ וְדַבֵּר וְהִנֵּה רֶכֶב אֵשׁ וְסוּסֵי אֵשׁ וַיַּפְרִדוּ בֵּין שְׁנֵיהֶם וַיַּעַל אֵלִיָּהוּ בַּסְּעָרָה הַשָּׁמָיִם.
This means to say as follows:
Eliyahu was frustrated with the limitations of olam hazeh:
וְהוּא הָלַךְ בַּמִּדְבָּר דֶּרֶךְ יוֹם וַיָּבֹא וַיֵּשֶׁב תַּחַת רֹתֶם אחת [אֶחָד] וַיִּשְׁאַל אֶת נַפְשׁוֹ לָמוּת וַיֹּאמֶר רַב עַתָּה יְהוָה קַח נַפְשִׁי כִּי לֹא טוֹב אָנֹכִי מֵאֲבֹתָי.
This frustration, and the desire to break out of these limitations, was the storm in which he left olam hazeh.
From which we can derive that if one has a stormy and tempestuous desire to break out of the limitations that olam ha'zeh imposes on him, then he may meet Eliyahu, because he is ben gilo.
I.e. if one wants to "see" Eliyahu ha'navi, he must also be עולה בסערה השמימה.
There is magical formula to have him appear.
You have Gemaras which say לא משתעי אליהו בהדיה about Amorim who were on a very high level.
For example the Gemora Kesubos 61A says
אבוה בר איהי ומנימין בר איהי חד ספי מכל מינא ומינא וחד ספי מחד מינא מר משתעי אליהו בהדיה ומר לא משתעי אליהו בהדיה
There were two Amoriam, Avuh bar Ihi and Minyamin bar Ihi, who apparently were equal in other ways.
Eliyohu spoke to one but not the other because the first one was careful to give his waiter the chance to eat from all the types food before the meal. The other gave him something to eat before so he shouldn't be hungry but made wait until after the meal until he allowed to eat from everything (Rashi)
So if you aren't living the type of life that first Amora did, don't expect Eliyohu to show up by you. Even if you are on a very high level like the second Amora