Image title attributes: Image titles don’t work on all
browsers the same way, which is why Google may not
put much weight into this content. However, if there is an
opportunity to gracefully include keywords, go for it.
ARIA tags: ARIA tags are similar to alt attributes in that
they help make website content more accessible to those
with disabilities. You can use ARIA tags on certain types of
dynamic content, interactive content, background images,
and more.
Video closed captioning and/or transcripts: Some videos
contain extremely relevant keywords, but Google has no
clue. Make sure what is heard and seen gets included in
your indexable closed captioning or transcript.
Schema markup: Schema helps add context to content.
When applicable, mark your keywords up with the most
appropriate schema properties to remove some of the
guesswork for Google.
WHY KEYWORDS ARE STILL SO VERY IMPORTANT FOR SEO