Using a Domain Service so our domain logic doesnt leak to the Application Service

ProposalService.cs

public class ProposalService
{
    public void AcceptProposal(Guid proposalId)
    {
        var proposal = _repository.Find(proposalId);
   
        proposal.Accept();
        _repository.Save(proposal);
             
        _domainService.DenyOtherCompaniesProposals(proposal);
        
        _logger.Info($"Proposal {proposal.id} was accepted");
    }
}