Allah is the most merciful. He tests people over a short period of time that doesn’t exceed 70 years on average only to reward those who have passed the test in Paradise for eternity with rewards that are far beyond imagination or to punish those who failed with torment in hell for eternity.
We belong to Allah and we are His servants and salves.
Whether you are patient or not, nothing is going to change except that you would have failed the test miserably by complaining, objecting and by describing the most merciful as “cruel”!
Your prayer has no value if you think this way about Allah and say such blasphemous things about Him.