It depends on what type of climate you'll prefer and what scenic beauty is in your mind.. If you are looking for cold and snow, then I have to say himachal, sikkim or gangtok will be the best option.
If you have love for history then opt for humpi or other outer bangalore spots or evel vishakapatnam.. These places are safe and best for solo travelling. Thank you
If you are a hard solo traveller....then you will go ..to any corner of world solo ...but in case of budget travelling...you can go Himachal, Uttrakhand and Punjab....in north...if you are trekker....must visit triund in Dharmasthala , Manimahesh in Chamba, Prashar lake trekk...if you love cities visit Punjab .... Amritsar is a balanced diet for travellers...and for cultural visit you can go to Uttrakhand... if you like my suggestions Upvote...this answer and thanks in advance.😉
If you are a hard solo traveller....then you will go ..to any corner of world solo ...but in case of budget travelling...you can go Himachal, Uttrakhand and Punjab....in north...if you are trekker....must visit triund in Dharmasthala , Manimahesh in Chamba, Prashar lake trekk...if you love cities visit Punjab .... Amritsar is a balanced diet for travellers...and for cultural visit you can go to Uttrakhand... if you like my suggestions Upvote...this answer and thanks in advance.😉