Al-Hafez ibn Rajab (may Allah have mercy on him) said:
[“Mu ‘li ibn al-Fadhil said:
“They (the first generations of Muslims) used to ask Allah to enable them to reach Ramadan six months before the advent of this month and were already asking that Allah Most High be pleased with them.”
Excerpt from Lataif al-Maarif, p.148.]
We too must prepare ourselves and the first thing to do are invocations to be able to achieve this, but not only.
Sheikh Saadi (Rahimullah) said: “If you ask Allah to make you reach the month of Ramadan, do not forget to ask Him to bless you with it because the important thing is not so much to reach the month of Ramadan but rather: What are the works that you will do during this month?!”
Yahya ibn Abi Kathir said:
“One of their supplications was to say: Lord, bring me, Ramadan! Allow Ramadan to take hold of me and Ramadan take hold of me and accept it from me.”
Repeat often:
“Allahuma ballighna Ramadan, wa barika lana fih, wa takabalhu minna”
“Lord, bring me to Ramadan! Allow Ramadan to seize me and Ramadan to seize me and accept it from me!”