Welcome to the community! There certainly is a lot to learn. I've been trying to immerse myself as much as I can over the last year and I'm still learning new things every day. .
Regarding upgrades that SaberForge offers, I'm going to copy/paste a post from SaberForge's facebook page:
Did you know that SaberForge offers send in 12w LED/sound/recharge upgrades??
You can send in your SaberForge hilt and have a SaberCore, 12w LED, and in hilt recharge added for 180.00
You can send in your compatible UltraSabers hilt and have a SaberCore, 12w LED, and in hilt recharge added for 220.00
You can send in your compatible MHS/Custom hilt and have a SaberCore, 12w LED, and in hilt recharge added for 220.00
Keep in mind that you can request SaberForge to send back your original internal electronics if you go with one of these upgrade options.
I'd also imagine that it's possible to upgrade a champion hilt to a hero hilt, which features two 6W colors that can be merged into a single 12W color, 5 sound banks, and lots of other bells and whistles. This is the new hero soundboard that allows you to twist your saber to change colors, which is a pretty cool feature
I do not know how much it would cost to upgrade a saber to a hero tier, though, you would have to contact saberforge directly about whether this is possible and how much it would cost.
Hope this is helpful!