Hello , welcome to the hobby and congrats on your first aquarium. I would say next step is to start reading as much as you can about different topics, starting to learn about what plants and fish you have in there and how to take care of them. There is alot to read, starting with this forum and more. Look for the podcast of Art Pennom , ScapeFU . It will give you an idea about what terms to search for.
Now for the suggested steps :
the plants in the back left corner, are not actual aquatic plants and will melt in time if kept submerged. The ones with the white edges. They do make quite nice house plants .
The anubias, the one near the rock, needs to have its rhizome above the substrate. The rhizome is the thick part from where the leaves and roots come from. You can tie it to the wood or rocks with a cotton thread or zip tie, but do not pull to hard.
You might also want to look into some fast growing stems such as Egeria, Cabomba. Some vallisneria or saggitaria will also look nice in your tank.
On hiatus till later this year