If you were to go brushless you wiuld have to change the motor and esc which you find on modelsport or cheaper ones on ebay and depending on what brushless system you get would me could maybe go up to a 3s or 4s lipo battery.
Heres a brushless system that would fit-https://www.modelsport.co.uk/etronix-photon-2-1w-system-with-11-0t-3450kv-motor-45a-esc/rc-car-products/383998 or https://www.ebay.co.uk/itm/9T-4370KV-Brushless-Motor-60A-ESC-Speed-Controller-Combo-Kit-For-1-10-RC-Car/202398789312?_trkparms=aid%3D1110006%26algo%3DHOMESPLICE.SIM%26ao%3D1%26asc%3D20200520130048%26meid%3D5e7e70b3238a4504ae4310900cc9a1f9%26pid%3D100005%26rk%3D2%26rkt%3D3%26mehot%3Dpf%26sd%3D353049525438%26itm%3D202398789312%26pmt%3D1%26noa%3D0%26pg%3D2047675%26algv%3DSimplAMLv5PairwiseWebWithDarwoV3BBEV2b%26brand%3DUnbranded&_trksid=p2047675.c100005.m1851