Mixed ages, listing, lots of extensions at various times. It will be very difficult to join it up iyswim. Is it on mains gas/does it have a septic tank?
TBF OP our house is a similar size and Arts and Crafts. Some of the interior resonated style wise. We rewired, replumbed, re-roofed, extended at the rear to create kitchen/family dining room/sitting room, repurposed some of the upstairs to create a dressing room and two extra bathrooms, modern security system. It was a lot more than £100,000 - double it then do it again.
What is the top valuation you would get if you make it perfect. Is it more than the purchase price and cost of renovations? Is it your forever home? Do you love it with your heart and soul? Does it fit with your life - schools, stations, family, interests?