Hi mayank, ill try to help you out here itself. Ask me any doubt, whenever possiible ill give some suggestions.
First thing is login daily and do some activity, not weekly once (Look out for few offers, surveys, click ads etc)
Earnings wise surveys are the second best option and tasks are no.1. So, concentrate on these.
Regarding surveys keep in mind we will get an avg. of 3 per week. At the most one can do 12 to 15 of them in 1 month. We can earn around at the most rs.1500 per month. So, completely depending on surveys is not wise and not worthful.
Simultaneously you also need to do tasks which are the major source of income. Be regularly active and do whatever available in level 0 with 80%. You lost the levels due to inactivity of your account. Since you have the experience of getting to level 3 before it will be easy again. There are a lot of level 0 tasks now, do them daily as much as possible to get the badges back soon.
After getting back the badges im not saying to work for 12 hrs a day. Having the level badges is like a mini asset, and you can work whenever there is free time. Everything will be easy then. 2 of my friends go to job and after coming back in the evening they sit around for 2 hrs daily and more in the weekend. Have patience and build up earnings gradually each month.
I hope this clears some confusion. Good luck