Hi there mrnothing -
it seems that physical activity helps greatly with reactivations, grounding especially but being in nature, swimming, running and yes, yoga. In terms of the blank canvas effect, this is not uncommon and can occur with other psychedelics too. What I would suggest is start trying new things in order to build up new connections to meaningful actions... learn an instrument, learn a language, try painting or drawing, or anything creative, volunteer something that could use your help... the sense of being in service is really valuable.
all the best,
Flux