Use one of these to distribute the power to each strip:

https://www.amazon.com/WUPP-Blade-Warning-Indicator-Damp-Proof/dp/B07GBST5NX

Includes 3 each of 5, 10, 15 & 20 amp fuses

Check the stats on your strips to ensure you putting enough power into them to operate at the brightness expected.

Rule of thumb is to use 60ma or .06a per pixal. At full power that's 18amps per strip.

With only 30a available from the power supply, you want to limit the strips to 50% brightnessand/or single color, then fuse each feed at 10amps.

If the far end looks faded or the wrong colors, run a power line to the far end to inject power from both ends.