I want to learn multiple languages but looking out for nearest languages to English, only to speak.
I currently speak Hindi, English, Telugu, and Urdu, where Hindi and Urdu are the nearest relatives.
To my knowledge, there does not exist a unique measure for which languages are closest to each other. Some alternatives follow. For purposes of language learning, I think these are a red herring.
However, for purposes of language learning, I would suggest considering Germanic languages, French, and creoles and pidgins of English and picking one based on your interests. They should all be fairly similar to English in some senses and different in others. Also, if your only motivation is to learn another language, why not pick one close to Hindi, Telugu, or Urdu?
The two closest are, as has been indicated by others, probably Afrikaans and Norwegian. Both of them, however, have pretty low practical utility, as both have comparatively few native speakers (Afrikaans is somewhere around 7.2 million, Norwegian is just above 5 million), each accounting for less than 1% of the world population.
If you want something a bit more practical, Swedish would be my first suggestion. It has:
Going a bit further than that in terms of practical utility, German or French would be my next recommendation. Both have much larger populations of native speakers than anything mentioned above, but both are also much further removed from English (fun fact, German is technically closer to English by linguistic taxonomy than anything else I've mentioned, but is less mutually intelligible than with it than Swedish, Afrikaans, and Norwegian). French is particularly painful because of the pronunciation.
Spanish is the last on the list of things I would recommend, it's got very different grammar and vocabulary from English, but the pronunciation is practically trivial compared to anything I've mentioned so far, it's generally one of the easiest languages to learn if you're coming from a background in almost any Indo-European language, and according to data on Ethonlogue it's actually more widely spoken than English in terms of native speakers (English still beats it if you factor in second-language speakers, because English has more second-language speakers than any other language (in fact, there are more people who speak English as a second language than speak any language other than Mandarin as a native language)).