I assume you already have some accurate kitchen scales to measure out your ingredients. If so, all you are really missing at present is a thermometer. A cheap digital one is good enough for basic home brewing.
If you stay with kits thats probably about it, apart from nice to haves. such as a brew belt or heat pad or a water bath (see below) for temperature control....
https://www.thehomebrewforum.co.uk/threads/how-to-set-up-a-water-bath-for-your-fv.66407/
...although some people build and use brew fridges (look it up on here).
And a second FV which you could use as a bottling bucket is useful.
Next if you are going to dry hop, you might consider a nylon or muslin bag in which to put the hops or a nylon sock over the end of the siphon tube. More on dry hopping here
https://www.thehomebrewforum.co.uk/threads/a-newbies-guide-to-dry-hopping-your-beer.61045/
And if you want to avoid keeping and maintaining lots of bottles you could invest in a pressure barrel (PB).
That's about it for kits.
If you want to do some extract brewing then you will need a stock pot.
https://www.thehomebrewforum.co.uk/threads/a-simple-guide-to-extract-brewing.75501/
And finally if you want to move to all grain the options are many and varied and you can get set up with a small amount of kit or buy something like a grainfather which will set you back £00s. Others will advise on this.
My suggestion to you is to stay with kits for a few brews, have a go at dry hopping or adding a hop tea to your beer, perhaps try a grain steep or a partial mash, then decide what you want to do. Most if not all of the equipment you use for kit brewing will be used if you go to extract or AG brewing.