@joojoobeans As you know, parrotlets are little bundles of energy and so benefit from a component of seed in their diet, maybe 25%. The Volkman's parrotlet mix is a good option for this. The next component of his diet should be the pellets, again roughly 25% or so. The Zupreem fruit blend is good, especially considering he wasn't eating any kind of pellets before, but maybe in the future consider switching him to a pellet without any artificially coloring or added sugar. Brands like Roudybush, Goldenfeast, TOPs, Caitec, or Harrison's are all good (the last four have the best ingredient lists IMO). Even the Zupreem Natural pellets would be preferred over the fruit blend (though some birds do like the taste of the fruity ones more).
Finally, you should be feeding fresh foods every day, and they should make up the bulk of your boy's diet (50%). Fresh veggies and some fruit is a must each day. I also never feed my seed dry, only soaked and germinated, to increase its nutritional value and provide another, highly preferred, fresh food.