I’m personally over all the spin-offs.
The reason Boba initially had a huge fanbase was he had the quintessential ‘less is more’ aspect. We knew very little about him aside from he was skilled, respected by Vader, and he didn’t fear talking back to him either.
A canon backstory or expansion only waters him down for me.
That watering down happened in 1983 when he comedically flew into a big slug’s mouth. The only thing missing from the scene was Yakety Sax. I’m not familiar with the prequels, but I know he’s shown as a little kid. Honestly, WTF Lucas?
For me, his reappearance and seriousness 40 years later in The Mandalorian is a long awaited return to gravitas.
Robot Chicken actually did a lot to make Fett cool again. And they explained his silly demise in ROTJ as having had way too much to drink on Jabba’s barge. 😉