I would get friends around the same rank and leve link rank 20 leve's till ya get another rank or two(which should only be a few leves) Once everyone is 23+ and can grab rank 30 leve's, leve link those, if you constantly leve link with people you can get a few ranks per reset till about 35ish, then more like 1-2 per reset till 45ish then maybe -1 per reset. It is a easy way to get sp and you can spend time playing with friends and linkshell members.