Sisyphus was a king in Greek mythologies where because of his deceitfulness, he was punished by the Greek gods in being forced to roll a boulder up a hill only for it to roll down every time it neared the top, repeating this action for eternity. This is oftentimes how I perceive the progress I make.
Take bouldering for example. Prior to COVD-19, I've was consistently climbing twice a week and was finally at a place where I felt strong and could take a problem I've never had before. But after no climbing for a few months, it felt like all the progress I've made before had reset back to a lower level and I have to make the long journey of climbing back again.
Often times we see growth as rolling this big boulder up a hill to reach a "peak" and achieve something, but the more I think about it the more I realize that reaching a peak also implies that it's downwards from there on out. Instead of seeing progress as achieving a new height, the biggest achievement is being comfortable in rolling that boulder, even without knowing when it'll end.