Richness of the soul only comes about through richness of the heart

Assalamualaikoum wa Rahmatullahi wa Barakatuhu.

Abu Huraira (ra) reported: The Prophet (peace and blessings be upon him) said, “Richness is not having many possessions. Rather, true richness is the richness of the soul.” [Sahih Bukhari 6081, Sahih Muslim 1051]

⇨Richness of the soul only comes about through richness of the heart, which must exist in absolute neediness of its Lord in all respects, realizing that He is the Giver and WithHolder, and renders thanks for His blessings. From this there develops the heart’s absolute need of its Lord, and the richness of the soul which renders a believer independent of all.

Ibn Battal said: ‘The hadith means that copious wealth does not constitute real richness. For many people upon whom Allah has heaped property are unsatisfied with what they have been given, and struggle to acquire more, and pay no attention to where it comes from; and such people are in reality impoverished because of their craving. Real richness is richness of the soul, which takes place when one finds a satisfying sufficiency in what one has been given, and does not covet more or struggle to seek it. That is the person who is genuinely rich.’

According to al-Qurtubi: ‘The meaning of the hadith is that richness that is useful, great or praiseworthy, is the richness of the soul. When a person’s soul is detached and independent, it loses its covetousness, and thus becomes exalted and splendid, and acquires more favour, detachment, nobility, and praiseworthiness than the soul of the wealthy person, who reached his position by impoverishing his soul through his covetousness, which plunged him into base matters and ignoble practices through the mean of his aspiration and his avarice. The rich person thus finds himself condemned by many people, whose estimate of him is low, until he becomes the most despised and base of men.’
[From Shaykh al-Islam Ibn Hajar al-Asqalani’s “Fath al-Bari,” translated by Abdal Hakim Murad in “Selections from the Fath al-Bari,” p. 8]

Indeed money is not everything, you can't buy your hereafter.
•►Allah says in the Glorious Quran: “Let not then this present life deceive you” (Quran, Surah Fatir: 5). as "The life of this world is nothing more than a distraction and diversion [from what is desirable] while the abode of Hereafter is far better for those who keep on guard [from its distractions and diversions]." [6:32] and
“The mutual rivalry (for piling up of worldly things) diverts you,Until you visit the graves (i.e. till you die)” (Quran, Surah At-Takathur: 1 – 2).

⇨The holy prophet (peace be upon him) said: "By Allah! I am not afraid that you will worship others along with Allah after my death, but I am afraid that you will fight with one another for the worldly things." [Sahih Bukhari Volume 2, Book 23, Number 428]

⇨Narrated Ka’b bin ‘Iyad: Allah’s Messenger said, “Verily, there is a Fitnah (trial) for every nation and the trial for my nation (or Ummah) is wealth.” (At-Tirmidhi)

•►Remember Allah says: "Content yourself with those who pray to their Lord morning and evening, seeking His approval, and do not let your eyes turn away from them out of desire for the attractions of this worldly life.." (Al-Kahf 18: 28)

⇨Narrated Anas (ra): The holy Prophet (peace be upon him) said, "O Allah! There is no life worth living except the life of the Hereafter, so (please) make righteous the Ansar and the Emigrants." [Bukhari 422]
Hold fast to your Lord and have firm faith in the Absolute and you will get every richness of self-contentment of this world and the hereafter in shaa Allah. Ameen.