Zero Knowledge rollups seem to be a promising way to achieve scale in a trustless way:
Discussion
Good that it is ”promising”; promising doesn’t do it for me as an explanation for the question how bitcoin could scale WITHOUT TRUSTED THIRD PARTIES though.
The linked article has more details if you want to do some reading
I have read it now and I understand that this Layer 2 is promising but presupposes changes in the functionality of the L1 (so maybe) and a continued development of the layer 2 itself. So maybe.🤷🏼♂️
The answer for this specific case is necessarily a "maybe" since it would have already been done had it been much easier to achieve.
I'm not sure what other kinds of answers you can get on the topic other than promising tech currently in development