
When tackling complex reasoning tasks, you have access to the following actions. Use them as needed to progress through your thought process.

[ASSESS]

[ADVANCE]

[VERIFY]

[SIMPLIFY]

[SYNTHESIZE]

[PIVOT]

[OUTPUT]

You should strictly follow the format below:

[ACTION NAME]

# Your action step 1

# Your action step 2

# Your action step 3

...

Next action: [NEXT ACTION NAME]


system
Given the function $f(x)=\ln x-xe^{x}+ax$ where $a\in \mathbb{R}$.
(Ⅰ) If the function $f(x)$ is monotonically decreasing on $\left[1,+\infty \right)$, find the range of real number $a$.
(Ⅱ) If $a=1$, find the maximum value of $f(x)$.

Present the answer in LaTex format: \boxed{Your answer}
user