Indian citizen – worked in the UK but returned to India – visa and bank expires in a year – how to invest my UK savings?

Context: I worked in the UK for a year on my graduate visa. Saved around £10K. Now I’ve returned to India. I don’t have to use that money right now. It can stay as an investment for however long. My visa is for one more year. The money is in my UK savings account.

My questions are:

Is it best for me to invest my money in pounds or to convert it to INR and then invest it?
What type of investing do you recommend?
Is there anything I should keep in mind considering my money is abroad and that my visa is expiring?