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...

Protostar Flockboard
https://www.fpi-protostar.com/flockbo...

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/adap...

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!