This season the gap between PSG and Lens was not too big and Lens could even take their place if they didn't lose points in this season is some matches they had, because of this little gap and bad performance in PSG I think the owner of PSG will not spend money like this for the next season be they invested once and they didn't get good results. These people are wise enough to take lessons from the mistakes they had.
Or maybe they will spend even more to hire better players than what they had.
PSG's ambition to pursue the UCL trophy is quite large. even though they always fail, but I think they will still be looking for some players for the transfer market this summer. moreover they were left behind by several important players in the squad. of course if you want to compete PSG have to spend quite a lot this season. unless they only want to dominate Ligue 1 without having a UCL target like in previous seasons.