They are keys that you can use, but they are not the password that you will need to take it's monetary value.

Maybe you can keep your account, cause you never know if you will find your password. I would at lease have two accounts if I were in your position. It won't hurt to have two accounts.

Once you get your new account you can start all over again. If you were to start again I would have more posts than followers and I would have more followers than following.

You don't really want follow for follow. Just follow those who's content you really like and can grow from. Concentrate on putting out as much good content as you can out there and your reputation will grow. Do this and your monetary value will rise.