Recently ETH got huge price increase. Is there any specific reason for that much of Increase ?

I would not say that the price has increased very strongly, it has grown in comparison with the dollar, but the price relative to the bitcoin has fallen very much, so expect to return to the previous highs relative to the bitcoin
Yeah if you compare ETH with the dollar price or fiat then the price of ETH looks rising but if you compare it with bitcoin. you can see the price of ethereum is decreasing. because at the moment bitcoin is still strengthening and making eth price weaken. but you do not have to worry. as many have said that the ethereum will return to strengthen and make the price even higher
On the other hand. The ether grew on the background of the stagnation of bitcoin at $ 17,000. Now the situation has changed. Bitcoin is growing again around $ 20,000, and the air has stopped growing, he stopped at $ 700. The conclusion is simple, bitcoin grows, violas either fall or remain in place.