This blog now has 801 new spells – growing from just a handful many years ago. It has taken significant effort to get new concepts in the last six months and the best source is participating in stories; then considering how that odd spont cast spell, or problem, or “if only we…” moment might be changed into a reusable spell.
If I’m being honest there are many spells which demonstrate a concept, and then have 2-3 variations to suit subtle differences or different uses, which makes it feel more like there is an order of magnitude less in the New Spells page if only the spell concepts should count.
Even so, it’s still a huge list. I hope some are useful in your stories.