Organisations like Animal Charity Evaluators (ACE), Wild Animal Initiative, Animal Ethics, and Rethink Priorities do research on wild animal welfare, with one of the aims being to eventually have discovered enough to start designing robust, cost-effective direct interventions to begin actually reducing the problem.
Ideally these would be competitively cost-effective to interventions against factory farming cruelty, but it's not guaranteed.
A few hypothetical proposed but insufficiently researched near-term interventions include:
Switching to more humane pesticides
Reducing harmful aquatic noise
Eradicating particularly cruel animal parasites e.g. the New World screwworm
Population control of animals via sterilisation
Related questions
@notrickspringfield population control of animals (instead of predation, disease, starvation etc), not people lol
@notrickspringfield You may find the following pages of interest
Introductions and advocacy pieces
Wild Animal Welfare Problem Profile by 80,000 Hours https://80000hours.org/problem-profiles/wild-animal-welfare/
Wild Animal Suffering by Vegan Hacktavists https://wildanimalsuffering.org/
Why Wild Animals by Animal Charity Evaluators https://animalcharityevaluators.org/donation-advice/why-wild-animals/
The Importance of Wild Animal Suffering by Brian Tomasik and Center for Long-Term Risk https://longtermrisk.org/the-importance-of-wild-animal-suffering/
Research
Wild Animal Initiative https://www.wildanimalinitiative.org/
Animal Ethics https://www.animal-ethics.org/wild-animal-suffering-section/
Essays on Reducing Suffering by Brian Tomasik https://reducing-suffering.org/#wild-animal_suffering
Rethink Priorities https://rethinkpriorities.org/
Misc
Wild Animal Suffering on Wikipedia https://en.m.wikipedia.org/wiki/Wild_animal_suffering