How could one make it so the Anglo-Saxons never colonized England?

Okay, so I'm working on a TL, and I have it mostly kinda figured out. It does have a bit of wanking when it comes to Celtic culture in the British isles, but I'd like to say that it's mostly plausible.

Thing is, it needs a good point of divergence. I know that the Anglo-Saxons were taking advantage of the power vacuum the Romans left behind when they left Britain, so what would have to happen to make them think it wasn't worth it/not consider it in the first place/decide it wasn't a very good idea?
 
Germanization of Britain was not made by coherent ensembles of peoples taking advantage of the utter collapse of Roman state in Britain, but rather various familial or clanic communities that came from more or less all the North Sea coast from Norway to Belgium, making stopping them quite hard without butterflying away the whole situation with a IIIrd or IVth century PoD. It doesn't help that most of these communities mixed with remaining Britto-Roman structures and communities (Eastern Anglo-Saxon kingdoms essentially spoused early Britto-Roman entities), and took the lead thanks to better connections with the mainland.

What you could do get with a fair plausibility, would be to limit this historical germanisation to the immediate coast.
Summarizing it briefly, it's goes down to stabilizing Britto-Roman high-kingship structures that reappeared in post-imperial Britain, admitting they actually entierely disappeared : Riotomagus, Ambrosius Aurelianus (probably the same person) in southern Britain and Cole Hen in the North are known historical exemples.
From historical military-political leadership which may have followed late Britain provincial lines, you'd need to reinforce them against the regional and local divisions (which were particularily important) and maintain a Pict or Irish-like geopolitical stability. With the right PoDs you could see the "second wave" of Germanic advance (which generally took the form of mercenaries/quasi-foedi inheriting or taking over Britto-Roman kingdoms, as in Lindsey or Bernicia) halted and high-king power relatively accepted (while far from centralizing).

EDIT : Giving that Britto-Roman coalitions seems to have a distinct military aspect (which would make it on part with some earlier exemples of high-kingship in Britain and Gaul), it may not ask much more than being victorious enough while Britto-Germans would be weakened ITTL.
The big problem is that there's no sign of a clearly stable succession of dominant kings, except once Brittons got stuck in Wales. The biggest obstacle would be a legitimisation of continuous high-kingship, that I think would be better regulated with a strong enough use of German mercenaries (possibly what Brittons did in Wessex, using old Saxon Shore Barbarians).

So a PoD weakening Anglo-Saxon dominance over IOTL Northumbria (at least in Bernicia) and in Wessex (possibly trough a Frankish failure with an earlier death of Childeric diverting part of North Germanic settlers to Northern-Western Gaul) is mandatory.

I'd expect in this scenario to have at least 2 high-kingships emerging out of post-imperial Britain (cut by a Norfolk/Boston line), but no more than 3 or 4. Especially if kingdoms like Wessex that were most probably Germanized Britto-Roman kingdoms led by local dynasties are kept in this ensemble (or lead them eventually), and contact with Gaul are maintained, you might have enough ground to stabilize a roughly Norfolk/Kent line of Britto-German kingdoms (which would still be particularily influent, if not hegemonic)

From there, I don't see why Britto-Romans couldn't go trough (if I don't think it would be completed particularily easily and quickly, especially giving a poorer geopolitical situation) the same model of evolution from chiefdom to complex chiefdom until emergence of early states Anglo-Saxons did. It could possibly even include some or all of Britto-German kingdoms in the end.
 
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Thinking about it, it could be argued that Britto-Roman high-kingships doesn't need to be entierely dynastical (while like it happened in Pictland and Ireland, dynastical connection is likely to be a necessary feature, would it be only for stability reasons) but adopting a regulating assembly as it was known in pre-Roman Gaul (altough probably more inherited from the thin inheritence of British municipes, military necessities and Celtic legacy) with leaders of the "" " national" " (in lack of a better word) or provincial coalitions were chosen by delegates.
The caveat is that it would make the transition easier, but it would really prevent a quick unification of Britto-Roman polities, if allowing it in the foreseeable future of the PoD.

So, all in all, choice by delegation (which generally favoured kings/entities with a political dominance in the region, safe in case of storng opposition) might be helpful but not the outcome solution : better integrating it in a high-kingship Pict-style.
 
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