When modifying the settings of the dimensions you can RTP in I couldn't figure out the nether and end's syntax. I tried the following [nether][end]. [the_nether][the_end]. [the_nether],[the_end] etc. Thank you for the help and great mod.

They should be the same as the vanilla identifiers (what you'd get for autocomplete for /execute in <dimension_id>), so the_nether and the_end should be correct. (Since that hasn't worked for you, let me know howminecraft:the_nether, does -- that's the full name.)

I'll also double check locally

I tried that and it still didn't work. I'll just send the line.
rtp_enabled_worlds=[overworld][minecraft:the_nether][minecraft:the_end]

try

rtp_enabled_worlds=[overworld,the_nether,the_end]

aaaaaaahhh, thank you so much, I hope you continue making this mod it is so good have a great day.

happy to help! Thanks for the kind words <3