G5 is at least two years away. The second MLP motion picture that sets up the new story line for G5 won't be released until October of 2021. Everything was pushed back before the pandemic arrived, so there's even a greater risk that G5 will be delayed.
Many of the side projects for G4 revolved around Equestria Girls and several short series like Hello Pinkie Pie and the new G4.5 that launches in Canada on the 21st.
Oh, and you can take in the first MLP The Movie if you haven't seen it yet. It meshes very well with the gap between Seasons 8 and 9 of MLP:FIM.
Check YouTube for MLP. You'll find a lot of things there.