What do you think our Army must do so all these pkk/ypg dogs are done forever? What is the plan, continuing like this for decades with a few kills here and there?
If we assume ground force invasion is not allowed:
We need Barzani to take full control of the border in Iraq with forces we trained. I say Barzani because we do not want an Iran on the border and Iraq is currently strongly influenced by Iran. This would just allow more attacks by PKK to occur under Iran's umbrella.
We also need a way to influence the autonomous region so the government changes into a second Barzani or other structure we can influence through trade. This way the recruitment pool and spread of PKK ideology ends.
Without ground invasion, SNA, HTS or Assad can not attack the YPG and risk America retaliating. It is also shown that there is no internal rebellion that will be successful. Currently, the west treats it as the model of governance for Syria and view it as the replacement to Assad.
Currently it is difficult to say the war against the PKK is successful, the location just changed. The PKK is now a state with an army larger than ever before to our south. They are also not isolated from the world and can form relationships with East and West, as well as damage TR's reputation.
The assassination campaign of PKK leaders in Syria might allow a friendly structure to occur, but the conflict is very heated at the moment and the chance is very low.
Due to the political situation in TR, any negotiations might lead to political suicide.