How I can reduce my over stay fine in UAE

Regarding stays in the country’s circumstances, it is:
A decision was issued by the Council of Ministers to extend the residencies for a period of three months, which can be extended without any delay delay in exceeding the residence period, while exempting residents from any financial irregularities during this period, and a content decision was issued stopping the calculation of administrative fines and on the violations that result from the services provided by the Federal Authority for Identity and Nationality and approved by the Council of Ministers, during a period of three months, starting from the date of April 1, 2020, and this period is extendable. There is also a guaranteed decision to grant a temporary license for a project to use digital transactions in the work of the notary, and the decision also included extending the validity of federal government services that ended on the first of March 2020 or expired within the specified time limit for a period of three months, which is extendable. It starts from the date of 1/4/2020, and also includes documents as well as permits as well as licenses as well as commercial records and the like.

We would like to inform you that the UAE Cabinet has taken several decisions and facilities by directing the authorities to exempt the owners of residency fines until the end of the year.

Then exemptions from residency violations until the end of the year due to the Corona virus and the current repercussions in the country

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It is different whether your contract is fixed-term or unfixed
If your contract is fixed-term, you cannot terminate it unless after the expiration of the contract term
If your contract is unfixed, you must notify your employer before the terminating the contract, depending on the period you have spent with the employer. The UAE Labor Law stipulates that:
Article 113
An employment contract shall terminate in any of the following cases:
By mutual agreement of the Parties, provided that the worker's consent is given in writing;
Upon expiry of its term, unless it has been expressly or implicitly extended according to the provisions of this Law;
For the convenience of either party to an indefinite term contract, provided that the provisions of this Law concerning the notice and the valid grounds of termination without arbitrariness are adhered to.
Article 116
Where a contract is revoked by the worker for reasons other than those specified in
Article (121), he shall be required to compensate the employer for any damage the latter sustains as a result, provided that the amount of compensation shall not exceed half a month wage for three months or for the remaining period of the contract, whichever is shorter, unless otherwise stipulated in the contract
Article 117
Either the employer or the worker may terminate an indefinite term contract for a valid reason at any time following its conclusion, by giving the other party a notice in writing at least 30 days prior to termination.
For the daily-paid workers, the notice period shall be as follows:
One week: if the worker has been employed for more than six months but less than one year.
Two weeks: if the worker has been employed for not less than one
year.
One month: if the worker has been employed for not less than five
years.
According to the given facts and for clarification purposes, we would like to explain to you,
According to the federal labor law in regards of resigning from work without the consent of the employer, it is the two cases
 Article (118)
The contract shall remain valid during the notification period referred to in the preceded article and shall terminate on its expiry. The worker is entitled to his full wage for this period based on the last wage, and he should work during this period if the employer requires so.
The parties may not agree on the exemption of the notification condition or to reduce its period, however they may increase this period. 
Article 121
A worker may leave work without notice in one of the following cases:
1-    If the employer violates his obligations before the worker in the articles stipulated in the contract or the law.
2-    If the employer or his legal representative signs an assault on the worker.
Article 128
A non-National worker, who abandons his work without a valid reason before the expiry of his definite term contract, may not, even with the employer's consent, take up other employment until the lapse of one year from the date on which he abandons his work. No other employer may knowingly recruit such worker or keep him in his service before the lapse of such period.
Article 129
A non-National, who notifies the employer of his desire to terminate his indefinite term contract but abandons his work before the expiry of the statutory period of notice, may not, even with the employer's consent, take up other employment until the lapse of one year from the date on which he abandons his work. No other employer may knowingly recruit such worker or keep him in his service before the lapse of such period.