There's a shit load of videos on Youchube covering this subject, You've probably seen many of them.
Unfortunately a lot of them all say exactly the same super obvious things; like cancel unused subscriptions and memberships for example, that one always gets mentioned first.
Now, whenever I hear that as point 1, I stop watching, as from experience it means that the entirety of the rest of the video, will also just be covering the same old points, that everyone else covers.
There's many other points besides the subscriptions and memberships that always gets mentioned too.
If I can find a couple of the more original videos I've seen, that stood out for covering the subject in an original, different, or better way, I'll post them.
The problem is that my liked videos and watch history is absolutely rammed, so it may be very difficult to find the relevant ones, as they'll be like needles in a haystack.
A personal opinion, and method of mine, is that you can save a lot of money by totally cancelling terrestrial TV subscriptions to providers such as Sky or Virgin Media.. All main 5 terrestrial channels do "catch up" services that you can stream online for free. Apart from the BBC's Iplayer, that you have to legally pay the licence fee to watch, obviously. I genuinely don't watch anything on Iplayer, nor any BBC live streaming, so I also save £180 a year, because I don't legally need a TV licence, as I don't watch anything from the BBC, nor any "live television broadcasts" from anything that could be considered a TV channel. Many of the bigger (in addition to the traditional top 5 terrestrial channels) cable TV channels probably also do catch up streaming services, but I cannot be sure about that, as it's not something I've looked into in any depth, nor at any recent time, but IIRC I have watched catch up streaming for free from at least one Cable TV channels 'catch up TV', streaming website, at some point in the past. I think by this stage that more of these tend to be pay for services, as opposed to the free ones you get from channel 4, channel 5, and ITV, for example.
I find more than enough to watch on youtube, (although sadly the overall quality of the content is getting much worse of late, with the mass proliferation of AI slop, and the use of AI narration, which is also intensly annoying and offputting,) streaming the catch up services provided by the non-BBC channels, and any films or TV box-sets I want to watch are generally super easy to download completely free using P2P torrent services.