I don't increase and decrease my rating.

your opponent was probably paying you a compliment ie your play seems stronger than rating.

@SaNyob
There is a large difference in your lowest rating and highest rating in all time controls.
But this doesn't prove you are a sandbagger.
If you look at your profile in lichess.org and see your all time rating graph, it can be seen that your rating has increased gradually with time. A sandbagger's rating increases suddenly only in one week or so, but your rating has took months to increase.
This proves that you are not a sandbagger.
By the way, you could have tagged me in the first comment since I only told you that in the morning.

Take care.

Thank God you remember

@Diwaditya stop trying to trick us that this topic is closed. Everyone look at his post and see it isn’t closed until a moderator says so.

Also, closed topics say “This topic is closed.“ not “This topic is closed now.”

Why