If you have worms and you are losing a lot of birds please consider that throwing more food into one bird is not solving your problem. It is not advisable to try to make anything gain a lot of weight fast if you are concerned about long term health.
There is an underlying problem that needs to be addressed. Feeding the parasites higher quality protein isn't the solution.
If a vet is not an option you can take varying approaches depending on your circumstances.
Diatomaceous earth in the feed is one method of dealing with some internal parasites, and dusted externally for mites that might be causing anaemia.
Probiotics and vitamins in the water to compensate for lost nutrients and boost immunity to help them fight the parasites.
Fresh garlic and oregano oil to help them pass worms. Chaga tea for immune booster, anti inflammatory, gut healer, appetite stimulant, warmth and energy.
Treat everyone.
Clean out your coops to try to interrupt life cycle of parasites. Keep coop dry and fresh air circulation.
If you're losing birds at an increasing rate you need an immediate and thorough clean out. If you just focus on bulking up one bird when you suspect parasites you are not helping your situation overall.