there was a similar discussion here a while back about how to replace some google services. i have linked it below.
i haven’t heard of new services by purism. if you could provide a link, that sounds like it would be interesting to check out. i personally use firefox web browser with duckduckgo for my web searches. one of the only things i use gmail for is because android requires it for google play services. i’m not sure there will be any kind of proper replacement for that until there is some kind of open source phone alternative, but there are plenty of other email services. in general all gmail gets from me is their own notices and/or spam.