The RDQ lipo and the Avon props are definitely the best bang for your buck upgrades. If you don't mind a bit more work and some soldering the camera upgrade is worth the effort.
RDQ 525mAh HV 1S: https://www.racedayquads.com/products/rdq-series-525mah-1s-80c-hv-ph2-0-lipo-battery-for-emax-tinyhawk?variant=20684519047281
EMAX 16500Kv Motor: https://www.racedayquads.com/products/emax-08025-16500kv-motor-for-tinyhawk-brushless-tiny-whoop?variant=20670653169777
Avon Turtle Mode props: https://www.racedayquads.com/products/emax-avan-tinyhawk-th-turtlemode-4-blade-40mm-propeller-1-set?variant=21265682661489
Caddx EOS2: https://www.racedayquads.com/collections/all-micro-fpv-cameras/products/caddx-turbo-eos2-1-3-cmos-1200tvl-4-3-2-1mm-lens-ntsc-fpv-camera
Camera Bracket: https://www.thingiverse.com/thing:3549545
