You're holding yourself back on that frame, the slack head angle and long chainstays aren't ideal for street, it's much more of a dirt jumping bike.
You can always help that slack head angle out by going to an 80mm or even 65mm fork, or fully rigid.
Singlespeed for sure, street is bad juju with derailleurs in my experience.
A high rise bar can help, it keeps your more upright and you have more weight over the back of the bike because your hands are sitting higher up, it helps with manuals a lot and IMO it helps with spinning as well.
Nice grippy flat pedals, the jackshits I tried were nice, so if you have those on there right now, keep 'em.
No unnecessary knobs on the tires, they just slow you down. Don't buy maxxis hookworms, they are a DH tire and weight nearly 3lbs each.