Is it possible to help negotiate an agreement? Why have they stopped paying rent? Have they stopped paying all of it? For how long? If they're in a debt spiral, they may need some help managing their bills. If it's employment, showing some compassion might make them eager to pay back rent as soon as they get another job. Might take some upfront effort, but this could be a far more sustainable business model than evicting them and finding someone else. The world economy is fucked: hay no guarantías que la próxima será mejor… (i hope that last bit means 'there are no guarantees that the next one will be better'!)

Are there any renters unions in your area? Getting the tenant involved with them might help them legally or practically. In the UK, we have Acorn which do a mixture of direct action (ie literally blocking Landlords from accessing the property) and supporting tenants with navigating the legal system and understanding their (somewhat limited) rights as renters.

If there's something comparable in your local area, perhaps approach them with the consent of the tenant? If there's not then perhaps there's similarly minded people which you can help to start organise and bring into the fold?