Review request 18k vs 14k

This is a game that I lost recently. During the game I felt like I was in a even or perhaps even strong position until move 68, when everything seemed to fall apart.

Curious to know if my assessment was correct, what I could do about the situation, and how not to get into that position in the first place.

All comments gratefully recieved

(Please ignore the cut at the end, was a hallucination and never worked)

The focus of this game should be on the center. But even black did as follows, the situation of black cannot be said good. Problem should be more ahead.

Sometimes it is unavoidable to enter the opponent’s territory, but also as early as possible