Your next big step is building an Assembler and a Centrifuge.

The assembler crafts many components more efficiently than manual crafting and is required for several parts that cannot be made properly by hand.

The centrifuge handles resource conversion that the rest of the tech tree depends on, including ore clumps, carbon fibre production, and later fluid processing once you attach the proper addon.

Both machines need RF power, and both become much more useful once you understand addons.