If you’re stuck, put points into Wraith (maybe also Blue / Yellow Crossroads) it will help you get all the smaller constellations except the 3 big ones. After that you can respec from Wraith and Yellow / Blue Crossroads.
Blue crossroad
Bull
Assassin’s blade
Eel
Hammer
Dire Bear
Purple crossroad
remove Hammer
Sailor’s guide
Stag
Solemn watcher
remove blue crossroad
obelisk , LoE , tree , scales