My honest opinion. Don’t do anything.
As it’s your first home, save your budget for the interior and, maybe, your back garden. Those are the places you’ll spend most of your time, so make them how they work best for you/feel homely while you’re living there. That’s where you spend your time, am assuming you don’t sit outside looking at your house.
If/when you ever want to sell, then maybe revisit the exterior, but even then am not sure if I’d go to the trouble. If the interior and garden are sorted and well thought out then the exterior can be ignored.
If I had a gun put to my head and HAD to make a decision on the outside, it wouldn’t be easy - you’ve got a mix of materials there, plus a lot of windows. I’m not very imaginative when it comes to the outside, but maybe wood cladding to bring it all together? I quite like a good wood-clad house, but I’m not sure if even that would look right given how many windows you have - it could end up looking odd.
If you do decide to do something, you need to make absolutely sure that the materials are right for the structure of your building. All buildings, whatever they are made of originally, need to be able to “breathe” (ie not trap moisture). You can’t just decide on something that then takes this away (looking at you, the prior owners decades back that clad my timber property in concrete!).