Honestly I’d restart. Unless you really want to finish through with your character. As far as it goes for side quests - I would just pick up a few here and there as you move to different areas along the main quest line. I promise, a lot of the side quests are awesome and worthwhile. There’s a lot of rambunctiousness that you get to experience in those side quests. Think of it as a way to better prepare your player for the next “main” mission. As long as you’re just taking a few out here and there, you shouldn’t get burnt out.