Capital gain 54 F

I have two houses purchase in 2000 and in 2019 in my name. Sold plot in  Oct 2021 to utilise capital gain to purchase new house bigger one. Entire consideration kept in capital gain Account with psu bank. 54 F.4 month to remain to utilise capital gain if purchase new house or 1.4 month to construct new house.

Now wish to sell one house to purchase new bigger one which is under completion  to utilise capital gain of both.Looking  advice on it to get more clarity