People get stuck for years on the philosophy main quest while refusing to do side quests. That is not how you play RPGs. Side quests let you get extra levels, gear and practice which make the main quest easier to make progress on.
An example of a side quest would be speedrunning a Mario or Zelda game. That would involve some goal-directed activity and problem solving. It’d be practice for becoming skilled at something, optimizing details, and correcting mistakes one is making.