As A User of the Victron 75/15, I’d recommend getting data off the 75/10 and the 220 watt panel With what you have now and then use this to decide what you really need.
I use mine for a 24 volt battery bank and it maxes out at 420 watts, so a 75/15 in a 12 volt system would push 210 watts.
To get this much wattage, I overpanel my Victron SCC by quite a bit. I run 100 watt panels 3S 3P so that I have an East, South and North Facing arrays when I need it to push 300 watts for hours on end from sunup to sundown. There is around 9 amps coming into the SCC and with the voltage conversion, 28 volts and 15 amps goes into the battery.
When your system grows, it could be to 24 volts, or you could want to get a new series of panels run by a seperate SCC. My RV has three SCCs on it.