Gurudev - It is definitely guaranteed. Arjuna asks the same question in the Bhagavad Gita.
So, Lord Krishna replies, ‘Nikhikalyanat karat kadastam tatta gakhti' (na hi kalyāṇa-kṛit kaśhchid durgatiṁ tāta gachchhati in chapter 6, verse 40 of Bhagavad Gita), which means one who does good deeds, they never go down. He can never suffer pain, neither in this world nor in any other world. You will always rise to higher levels of existence.
You will be born in a good wealthy family, and due to the memories of your old life, you will start with that, where you left off. So do not worry. Your actions and meditation will never go away.
For one who walks the spiritual path be assured that you will only move higher and higher.
