Proposal service with anemic domain, and no domain service

ProposalService.cs

public class ProposalService
{
    public void AcceptProposal(Guid proposalId)
    {
        var proposal = _repository.Find(proposalId);
        //calling Accept method instead of changing its properties
        
        if(DateTime.Now.Substract(proprosal.SentAt).TotalDays > 15)
            throw new DomainException("This proprosal has expired");
        
        if(Status != ProposalStatus.Pending)
            throw new DomainException("Cannot accept or deny this proposal");

        proposal.Status = newStatus;
        proposal.ClosedAt = DateTime.Now;
        
        _repository.Save(proposal);
        
        var proposalsToDeny = _repository.FindOpenForCandidate(proposal.CandidateId);
        foreach(var p in proposalsToDeny)
        {
            p.Status = ProposalStatus.Denied;
            p.ClosedAt = DateTime.Now;
            _repository.Save(p);
        }
          
        _logger.Info($"Proposal {proposal.id} was accepted");
    }
}