Oof. That's... basically nothing. Enough to charge a phone or GPS
It's relative. In Thailand, where you need to charge your phone and not much more? it's a lot. In the arctic circle, where you need to heat your visor? it's nothing. If you think of it as a Super Cub variant, it's a Thailand manufactured bike designed in Japan that was most popular in Vietnam. Only one of those countries ever gets actually cold by any reasonable standards. Japan seems to favor passive approaches for the motorcycle, like pogies, windshields and leg shields.
I can explain the numbers or you can take my word for it, but you'd easily be able to run 3 phones charging and 3 GPS's at the same time without draining the battery on this bike. You probably saw my comment that it's already running LEDs so there's not much more you can do to reduce power consumption.
Your options are generally to either add power generation, or add power reserves. Regarding the solar panel, I saw a concept using the
Zeed Parts luggage box that had a solar panel strapped to the top. So someone else thought the same way, and if you were really going bush with absolutely nothing nearby, that'd be a pretty good option (charge provided per day would be in the 12,000 mAh range).
If you look towards bikepacking - how do bicyclists solve the probem? Nowadays there's a shift away from dynohubs. It's usually 6500-13000 mAh battery packs for portability, with a recharge every few days or at restaurants. Maybe plan to stay in a hotel every few days and charge all the batteries up there.