Keep putting Micro-Sol on the decal. Let it dry between applications. (If you don’t you’ll most probably wreck the decal in the process of applying more Micro-Sol because the decal will, be liquefied.)
If you have an air bubble under the decal, you can use a needle to fix it.
If its not an overlapping wrinkle, (its just raised off the surface of the model) then you can try using a very sharp knife to cut the wrinkle and help the decal lay down.
If it’s an overlapping wrinkle, (the decal is folded over itself) then you should just keep applying the Micro-Sol until it blends in. It may be that you are stuck because there is a limit as to how much the Micro-Sol will work as you simply have overlapping decal material. But, hopefully, this will minimize the situation.
Good Luck! Let us know how it goes, or if there is another technique out there!