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To perform supplication with the most beautiful names of Allah with a diversify between them in a way that suits the supplication.
So, if He asks Allah a livelihood, he should call Allah with the name “Razak” while if He asks Allah a Mercy, he should call Allah with the name "Rahman and Rahim". And if he asks Allah an appreciation, he should call Allah with the name of "Aziz", and if he asks Allah forgiveness, he should call Allah with the name of "Ghafour". And if he asks Allah a heal, he should call Allah with the name of "Shafi".
Thus, he invokes what suits his supplication. Allah SWT says (And to Allah belong the best names, so invoke Him by them) [Al-A'raf: 180].