Do you have an idea of what your Syrian likes? For example, does he seem to like Timothy hay type items, or perhaps plain wooden blocks, or maybe food type things. We can recommend more personalized items if we know what his preferences are
Below are some favorites of my Syrians
https://www.amazon.com/gp/aw/d/B0049...B5L&ref=plSrch
https://www.amazon.com/gp/aw/d/B01F7...ZzL&ref=plSrch
https://www.amazon.com/gp/aw/d/B005F...mSL&ref=plSrch