The letter contains several grammatical errors, awkward phrasing, and some incorrect word choices. Here is a revised version with corrections and improvements:

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**Cherished,**

It has been a long time since our eventual confrontation, and I would not let my memory of this fade. As for the affairs between us, we had been adversaries and friends concurrently. In the aftermath of that tumultuous period, we scrutinized and opted for a neutral relationship between us. With your arrival in the nation where I reside, I desire to get to know you better through this letter and future correspondence.

How have you been? Has anything surreptitious occurred? Has anything injurious or jeopardizing happened to you? Has anyone been detrimental to you? Have you successfully found your own "snuggery"?

My apologies for this inundation of inquiries; I should not have asked you so many things. Nevertheless, I suppose that I am excessively jubilant and perturbed concurrently due to your sudden move to my "querencia." I have a strong desire to get to know you better, as our relationship has certainly improved positively.

( ... )

I suppose that I would reminisce about the affairs between us from the "immemorial" time ago, and I would confide in you as friends. Would you remember the mountain ranges where we encountered each other? I would be ridiculously happy and excited to converse on this subject, dear. We had strived and struggled against each other before we neutralized our relationship. Afterwards, we became good friends. War and turbulence could separate people, I suppose. We had been obliged to throw stones at each other before we were liberated. It is a memorable thing to converse about and also to repent, I suppose.

( ... )

As for your initial time in this nation, I would aid you in getting acquainted with more local foods, beverages, and recreational spots, provided you desire. I suppose that we could have a walk around somewhere and experience things together.

( ... )

I would invite you to come to my home someday, and I am willing to have you as my guest for sure. Whenever you feel the desire, I would be willing to respond to your call and be prepared thoroughly and meticulously.

I hope that you shall gain more fruits and we shall become best friends.

Yours sincerely,

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Key corrections and improvements:
1. "Lengthening time" was changed to "long time" for clarity.
2. "Oblivescence" was changed to "memory of this fade" for better understanding.
3. "Scrutinised" was changed to "scrutinized" (American English spelling for consistency).
4. "Neutralised relationship" was changed to "neutral relationship."
5. "Arival" was corrected to "arrival."
6. "Apprised of You further" was changed to "get to know you better."
7. "Have You seeked fruitfully" was changed to "Have you successfully found."
8. "Inundation of inquiries" was kept, but "enquired You myriad things" was changed to "asked you so many things."
9. "Appetence" was changed to "strong desire."
10. "Augmented positively" was simplified to "improved positively."
11. "Reminisce regarding the affairs" was changed to "reminisce about the affairs."
12. "Confide with You" was changed to "confide in you."
13. "Blithe and frolicsome" was changed to "happy and excited."
14. "Coupd" was corrected to "could."
15. "Catapult the stones" was changed to "throw stones."
16. "Nourishments" was changed to "foods."
17. "Saunter" was changed to "walk."
18. "Appetence arises" was changed to "feel the desire."
19. "Respond Your call" was changed to "respond to your call."

These changes aim to improve readability, clarity, and grammatical correctness.