Here are my top 10 upgrades for a Newtonian telescope to improve it for astrophotography. These upgrades aren't specific to the SkyWatcher Quattro 150P; most will work on any Newtonian Reflector.
Links:
Sky-Watcher Quattro 150P
https://bit.ly/4aF8rJp
Backyard Universe Spider and Mirror Mask:
https://www.backyard-universe.de/en/i/upgrade-sets
Protostar Flockboard
https://www.fpi-protostar.com/flockboard.htm
6" Dew Shield
https://bit.ly/3zAeAIQ
Asterion Cooler NT6 Fan - Discontinued
Hotech Crosshair Laser Collimator
https://bit.ly/4bqkqd2
Ocal Electronic Collimator
https://amzn.to/3xN4Me3
Astro Essentials Compression Ring
https://www.firstlightoptics.com/adapters/astro-essentials-2-inch-compression-ring-adapter-for-sky-watcher-newtonians-and-72ed-refractor-m54.html
Telegizmos 365 Cover
https://bit.ly/3zk2h3k
Hopefully, some of this will help you improve the images you get from your telescope the way they have for me.
Clear Skies!