I would recommend checking out the thread 
Let’s Durtle the Scenic Route 
, as that ‘philosophy’ expressed there (taking it slow and steady, but especially to enjoy the process of learning) is closest to my current approach, and I’ve found it very helpful overall to maintain interest, maintain steady progress, and also to pretty much eliminate the risk of burnout.
As for resetting back to lvl 1 and radicals, yes I know the feeling of going tooo far back, but in the grand scheme of things, it’s only a couple of levels. Probably by level 5-ish you’ll start hitting things you forgot. And at that point you can slow right down to your ‘scenic route’ pace (i.e. whatever pace feels comfortable and sustainable and enjoyable to you), and before you know it, all the early stuff will go to Enlightened level, and then in a couple months you’ll be making your first Burns! Just remember to slow down to a comfortable pace once you start hitting things you don’t remember. Then just maintain (and sometimes adjust) that steady pace, and you’ll be safe from burnout forever. 
