I am sure that pitching more yeast at the initial pitch would help you on your next batch. For this one, you could try making a 1 quart starter (DME in water), and shake it up crazy, adding new yeast to it, and pitching that at high krausen into the main batch.
This is similar to adding speise- actively fermenting wort as in krausening.
Don’t let this setback hold your brewing back. Cheers and welcome to the forum.