In the process of selecting two people from five to be promoted to senior titles, everything is democratic and, open and transparent.

I would say ...
The process of selecting two out of five people to be promoted to senior titles was democratic, open and transparent.

I changed the tense to past simple because the following text is in past simple

OInitially, there was an on-site public election of a five-member leading group, which then worked out the rules.

After the meeting, I alsothen had in-depth communication with every comradlleague who failed to get his wish.

As a colleague, I will help with whatever I can, but I can't help anyoneothers with this matter, so. I can only follow the rules.

Furthermore, even if you are in charge at that time, you can't come up with a plan that can be put on the table and ensure your victory.

But in its placeHowever, I can't escape, knowing that it is a sea of fire.

But I never hated them, and I didn't report them out of nothingfor no reason.

No matter what you have done to me, I still hope you can get promoted as soon as possible.

In the process of selecting two people from five to be promoted to senior titles, everything is democratic and open and transparent.

I would say: The process for selecting two people out of five for promotion must be democratic, open, and transparent.

OFirst, there was an on-site public election of a five-member leading group, which then worked out the rules.

Changed because you use past tense in the rest of the entry

After the meetingelection, I also had in-depth communication with every comradeapplicant who failed to get his wish.

Here I would say election and applicant or candidate because otherwise the sentence is a little unclear

Unfortunately, some colleagues have blamed me for this.

They blamed you for having in depth conversation with the applicants?

If they blamed you for them losing the election, I would say something like "have blamed me for causing them to lose" or "have accused me of unfair election practices"

As a colleague, I will help with whatever I can, but I can't help anyone with this matter, so. I can only follow the rules.

Furthermore, even if you are in charge at that time, you can't come up with a plan that can be put on the table and ensure your victory.

The sentence is correct as is but I would shorten it like this to make it more natural:

Furthermore, even if you are in charge at that time, you can't come up with a plan to ensure your victory.

You can also say "incumbent" if you are referring to someone who is currently holding a position and is running for re-election.

My only mistake was that I shouldn't have been in charge at that time.

Also fine, but reads a little unnatural in a way that's hard for me to describe. I would suggest "My big mistake was volunteering to run the election."

I would appreciate other reviewers' opinion about whether this sentence seems natural.

But in its place, I can't escape, knowing that itI am isn a sea of fire.