For me it really depends on having a glider that can hold a combo. I am hoping for 2 frenzies in a race to set my upper thresholds. But unless its done with a great combo run, there's room to push further.
You can definitely push your Tokyo Blur 3 score way higher. You glider is better then mine and you can frenzy. I could see you getting to 15k maybe.
Drift off the line, collect the three coins. Release for the yellow turbo and aim for the outer coins in the turn. If you space it right you should be able to keep your combo going. If you hit the item blocks in 7th or 8th, there's a likely chance you'll get atleast 2 mushrooms that you can use to keep your combo going to the next set of item blocks. Then for me it's a hail mary depending on what items I get and when they hit for the thwomp stretch if I can get up to the coins in the turn.
If you can reach there, you should be able to keep your combo through out the track and come out with a higher score with even a single frenzy. If you manage two frenzies I could see you pushing toward 15k.