Want to change some votes for some delegates but i have to unvote some first cause I"m 101 full. Is there a way not to pay for the unvote fee since i"m full ?
No, if you want to free some slots you would have to unvote and pay 1 LSK for each unvote transaction but remember you can select upto 33 delegates in one unvote transaction.
In the official Lisk web wallet and nano wallet there is no feature which enables us to vote and unvote in a single transaction with just 1 LSK, however delegate cc001 has developed a tool which does this - for more info see
here.
Hope this helps !!