Here is a tip to speed up the initial blockchain download: increase the amount of cache for bitcoin. You should give it almost all of your ram during the initial download, as it makes a HUGE difference. On a 1TB ssd with a 300mbps internet it takes little less than 24hs to fully sync if I give it like 16GB of cache. You can change this on Umbrel by clicking on the three little dots on the bitcoin app, then Advanced Settings. Then, expand the tab Optimization and set the Cache Size to as much as you can spare. Save and enjoy your node going BRRRR.

(After your node has finished syncing, change this back to the initial value, as it is no longer needed and will only use up resources needlessly).