I know from historian colleagues that the market in that subject is very tough so I think you're right to think that stepping straight into a lectureship or a postdoc is the exception not the rule. And many people never get there even if they pick up p/t teaching for years. I think there are several things that might be worth you thinking about.
How geographically mobile are you? The less you can move, the fewer possible institutions you can work for and so the chances of it working out diminish.
How prepared are you to work at institutions very different to the one you are at? For the majority of institutions in this country, teaching and admin form a large part of the day to day role in the humanities, research can get sidelined. And students will be much less well-prepared than you are used to if you have studied at elite institutions.
Being a lecturer is very different from dong a PhD or a postdoc, and for some people the admin side comes as an unpleasant shock. Would you relish running a degree programme or acting as the departmental main point of call for students in difficulties? Or is that wholly unappealing?
Here's a resource that I personally think is very useful on academic careers and whether it's the right choice:

I've found this webpage helpful in the past too! If I recall rightly, I do think I found it a little pessimistic though - like the default position was that you should leave academia because it's hard and probably not for you - but maybe its intention is simply not to paint an unrealistic rosy view of things.

I suspect it's realistic rather than pessimistic. There's quite a few surveys that suggest PhD students do not have a realistic picture of what the job is like (or the job market), so I think it's a useful set of resources.

Completely agree. The problem is the most visible holders of PhDs are academics, therefore people assume that a PhD leads to academia. While the majority of PhD holders disappear into the industry and drop the Dr status, diminishing their visibility and thus people don't realise that the majority of PhD holders go there.

I think some PhD recruitment offices need to make clear that the most likely career path is industry, not academia. But that might reduce applications, and we can't have that!

It would be interesting to see a breakdown by country and by academic field.

It would also be super interesting to see a breakdown of why people choose to do a PhD - their primary reason. You know, to be an academic, for the challenge, to move up in their field...

I'll probably never see either of these things. Just a muse!

I think there is a growing number who do a PhD because they either cant secure a job or they cant decide what job to do and therefore see the PhD as a way of delaying a decision.
I know of quite a few who have done that.