I like John Vervaeke's framework for this. He prescribes an 'ecology of practices' that help us develop 'spiritually'/psychologically. The missing ingredient is a moral system and an overall structure. Many small groups are currently creating 'modern' religions, so it is up to those of us who are interested to participate, learn and help create the systems we want to see.

I think we also need a lot more study of religion and spiritual ideas to identify useful methods to teach philosophical/moral/psychological systems through scripture/rituals etc. There are many low-hanging fruit. Meditation is one such concept that has only recently become scientifically accepted in the west. Once it was well-researched it moved from 'alternative' to 'mainstream.' Most modern people are very skeptical of unstudied practices. In the same way we can re-frame behaviors such as 'prayer' and 'rituals' so they are not dismissed by a skeptical audience.