Solo camping tent recommendations

When it comes to tents, lightweight, spacious, 3-season and cheap don't tend populate the same sentence/paragraph. Nordisk do some really light tents but they are heavy on the wallet.
This is my current tent, just over 1kg without a groundsheet. It pitches really quickly and has a few nice design features but the material is really light so I feel like I need to be careful in case I damage it and when it's wet/windy I need to pay attention to guying so that the inner and outer are kept separate.

I think you need to answer a few questions, determine your priorities and work from there.

ie
1) What's the maximum weight you're prepared to carry?
I'd suggest 2kg

2) How high are you when you sit on the ground?
I'd guess 95-100cm so you'll need at least that much interior height, preferably a couple of cm more

3) What kind of space do you want? Is cooking/storage essential?
For me, enough space to sleep, store my boots and make a brew in the morning. If I needed to cook in the tent, I'd unclip the inner to make space. Given your height, I'd suggest you need a 2-man tent. I had a 1-man for years and, while I couldn't really fault it, it was a bit of a squeeze (I'm 6ft/183cm)
Also, if you're going to use it up the hills, you don't want the footprint to be too big.

4) What style of tent do you want?
Most light tents are single pole design and need to be pegged and guyed for stablilty. Freestanding tents are handy for awkward pitches (they can be put up and moved into the optimum position before pegging) but means extra poles and material = more weight

5) What other features are desirable?
eg

- Outer first/pitch as one. Most of the single pole/tunnel designs will do that, keeps the inner dry when you're pitching in the rain.
- Ability to unclip the inner from the poles
- Ability to cover the mesh on the inner. It's a sweeping generalisation but US tents tend to have a lot of mesh on the inner which is great for ventilation but makes them a bit cold. European tents tend to have less mesh and what is there can be covered for extra warmth.
- Number and location of the entrances.

I think once you have answers to those questions, you'll have a better idea of what you need and can narrow down your search.
In terms of makes, I would tend to look at European ones like Nordisk, Helsport, Vaude, Vango. The latter is probably the cheapest of the lot but they make some decent tents (or did - I've no idea what their new tents are like but I used a TBS Micro 100 for nearly 18 years with no complaints).
Once you determine what style/model of tent you want it's a matter of keeping an eye on muliple suppliers websites until it comes up a price you're willing to pay.
I'd also be looking at 2nd hand tents - bargains don't often come up on donedeal or adverts but it's worth keeping an eye out.