(4) Be aware that there is a color-coded value system for materials and motifs. (4) As you collect motifs/diagrams/recipes/patterns/etc., learn or sell them as soon as you can, so they won't clutter your inventory.
You may want to focus on materials for the crafts most important to you. Start by considering which crafts you want to focus on. (3) If you can't, or don't want to add ESO+, but you want to craft, you will need to be very strategic with your inventory. (2) Assuming #1 is correct, are you interested in crafting? If so, consider adding ESO+ if you can afford it.
(1) I'm guessing you don't have ESO+, or your materials would automatically flow into your unlimited crafting bag.
